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Sample records for juan nuevos datos

  1. Effect of channelization of Rio Puerto Nuevo on ground-water levels in the San Juan metropolitan area, Puerto Rico

    USGS Publications Warehouse

    Padilla, Ingrid

    1991-01-01

    Channelization and concrete lining of the Rio Puerto Nuevo and its tributaries in the San Juan Metropolitan area has been proposed to control flooding in low lying areas adjacent to the stream. Concern about the effect of these channel modifications on the ground-water system prompted the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers to conduct an investigation of surface-water and ground-water interactions in the Rio Puerto Nuevo basin in 1988. A principal objective of this investigation was to determine the potential effect of channelization of the Rio Puerto Nuevo on ground-water levels.

  2. JUAN BOBO. TEACHER'S GUIDE.

    ERIC Educational Resources Information Center

    A GUIDE TO HELP PLAN WORTHWILE EXPERIENCES FOR CHILDREN WHICH WILL PROMOTE VERBAL EXPRESSION AND ENCOURAGE THE USE OF LANGUAGE ARTS AND SKILLS IS PRESENTED. JUAN BOBO IS A CHARACTER FROM PUERTO RICAN FOLKLORE. HE IS A POPULAR FIGURE IN THE ELEMENTARY SCHOOL TESTS USED IN PUERTO RICO, AND HE HAS BEEN TRANSPORTED TO THE LOWER EAST SIDE OF NEW YORK…

  3. Remembering Juan Navia.

    PubMed

    Dasanayake, A P; Li, Y; Maetz, H M; Vermund, S H

    2013-10-01

    Juan Navia died on September 4, 2010. Those who knew him as the director of the University of Alabama's John J. Sparkman Center for International Public Health Education and later the dean of UAB School of Public Health watched him train and shape the next generation of global public health leaders with a kind heart and a firm, but gentle, hand. On this third anniversary of Professor Navia's passing, in response to an invitation from the Journal of Dental Research to write an essay on an educator who influenced the professional trajectories of many people, we have put together an account of some of his contributions and attributes to highlight this remarkable leader's accomplishments in and impact on dental public health and global nutrition. PMID:23887886

  4. Un nuevo estudio del cúmulo abierto Tr 14 en la región de Carina

    NASA Astrophysics Data System (ADS)

    García, B.; Malaroda, S.; Levato, H.; Morrell, N.

    Presentamos nuevos datos espectroscópicos de 9 objetos entre los miembros más brillantes de Tr 14. Hemos medido un total de 80 nuevos espectrogramas para contribuir a la determinación de la real naturaleza de estos objetos desde el punto de vista de la duplicidad. Del nuevo material debemos concluir que la mayoría de las estrellas en la muestra son simples. Sin embargo existen algunos objetos cuyo seguimiento debe continuar ya que no nos es posible efectuar conclusiones definitivas con el presente material.

  5. Nuevos sistemas de frecuencia intermedia para el IAR

    NASA Astrophysics Data System (ADS)

    Olalde, J. C.; Perilli, D.; Larrarte, J. J.

    Se presenta el diagrama en bloques de los nuevos sistemas de Frecuencia Intermedia para los dos radiómetros instalados en el IAR. Entre las características más importantes del sistema podemos mencionar la posibilidad de conectar cualquiera de las dos antenas a los ``backend" disponibles: analizador espectral de alta resolución (META II) de 0,05 Hz, autocorrelador de 1008 canales y contínuo. Se incorporan al sistema nuevos sintetizadores de frecuencia implementados con PLL y la moderna técnica de síntesis digital directa. Por último, el conjunto del sistema es susceptible de ser configurado por las computadoras de adquisición de datos, supervisadas por otra, que entrega el estado de funcionamiento actual y evita la selección de configuraciones incorrectas por parte del usuario.

  6. The Economic Impact of San Juan College on San Juan County, New Mexico, 1991-92.

    ERIC Educational Resources Information Center

    Clark, Mary Jo

    A study was conducted of the economic impact of San Juan College (SJC) in Farmington, New Mexico, on businesses and employment in San Juan County during fiscal year (FY) 1991-92. The five components used to measure the college's tangible economic impact on the local community were SJC's total expenditures in FY 1991-92 used to buy goods and…

  7. 33 CFR 165.754 - Safety Zone: San Juan Harbor, San Juan, PR.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... remain in the safety zone unless authorized by the Captain of the Port, San Juan, Puerto Rico, or a... through the safety zone with a Coast Guard designated escort. (3) The Captain of the Port and the Duty Officer at Sector San Juan, Puerto Rico, can be contacted at telephone number 787-289-2041. The...

  8. 75 FR 51098 - Protection Island and San Juan Islands National Wildlife Refuges, Jefferson, Island, San Juan...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-18

    ... Register on August 14, 2007 (72 FR 45444), announcing our intent to complete a CCP/EA and inviting public... Fish and Wildlife Service Protection Island and San Juan Islands National Wildlife Refuges, Jefferson, Island, San Juan, Skagit, and Whatcom Counties, WA AGENCY: Fish and Wildlife Service, Interior....

  9. 76 FR 12692 - San Juan National Forest Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-08

    ... Forest Service San Juan National Forest Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The San Juan National Forest Resource Advisory Council (RAC) will meet in... comments should be sent to Attn: San Juan National Forest RAC, 15 Burnett Court, Durango, CO...

  10. 75 FR 48306 - San Juan National Forest Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-10

    ... Forest Service San Juan National Forest Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The San Juan National Forest Resource Advisory Council (RAC) will meet in... comments should be sent to Attn: San Juan National Forest RAC, 15 Burnett Court, Durango, CO...

  11. 76 FR 40876 - San Juan National Forest Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-12

    ... Forest Service San Juan National Forest Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The San Juan National Forest Resource Advisory Council (RAC) will meet in... Sonoran Meeting Rooms. Written comments should be sent to Attn: San Juan National Forest RAC, 15...

  12. 33 CFR 80.1385 - Strait of Juan de Fuca.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Strait of Juan de Fuca. 80.1385... NAVIGATION RULES COLREGS DEMARCATION LINES Thirteenth District § 80.1385 Strait of Juan de Fuca. The 72 COLREGS shall apply on all waters of the Strait of Juan de Fuca....

  13. 33 CFR 165.754 - Safety Zone: San Juan Harbor, San Juan, PR.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... referenced use datum: NAD 83. (2) The waters around Liquefied Petroleum Gas ships departing San Juan Harbor... coordinates referenced use datum: NAD 83. (b) Regulations. (1) No person or vessel may enter, transit...

  14. Persistence and Attrition at San Juan College.

    ERIC Educational Resources Information Center

    Moore, Nelle

    A project was undertaken at San Juan College, in New Mexico, to examine findings from several studies of student persistence and retention to shed light on factors influencing persistence at the college. The project took into account several definitions of persistence, including re-enrollment in the subsequent semester (semester to semester),…

  15. Juan Carlos D'Olivo: A portrait

    NASA Astrophysics Data System (ADS)

    Aguilar-Arévalo, Alexis A.

    2013-06-01

    This report attempts to give a brief bibliographical sketch of the academic life of Juan Carlos D'Olivo, researcher and teacher at the Instituto de Ciencias Nucleares of UNAM, devoted to advancing the fields of High Energy Physics and Astroparticle Physics in Mexico and Latin America.

  16. Explorando nuevos horizontes en NASA

    NASA Astrophysics Data System (ADS)

    Villanueva, G. L.

    A pesar de la incesante expansión del Universo iniciada con el Big Bang 14 mil millones de años atrás, nuestro Universo se siente cada día más cercano. La inquebrantable vocación de la humanidad por descubrir nuevos horizontes ha permitido el acercamiento de civilizaciones en nuestro planeta y nos ha permitido conocer nuestro lugar en el Universo como nunca antes. En este artículo presento una breve sinopsis de nuestro trabajo que se relaciona con diversas investigaciones con implicaciones astrobiológicas, desde el origen de los ingredientes de la "sopa de la vida", hasta la evolución y composición de la atmósfera de Marte.

  17. Chinanteco de San Juan Lealao, Oaxaca (Chinantec of San Juan Lealao, Oaxaca).

    ERIC Educational Resources Information Center

    Mexico Coll. (Mexico City)

    This document is one of 17 volumes on indigenous Mexican languages and is the result of a project undertaken by the Archivo de Lenguas Indigenas de Mexico. This volume contains information on Chinantec, an indigenous language of Mexico spoken in San Juan Lealao, in the state of Oaxaca. The objective of collecting such a representative sampling of…

  18. Trique de San Juan Copala, Oaxaca (Trique of San Juan Copala, Oaxaca).

    ERIC Educational Resources Information Center

    Mexico Coll. (Mexico City)

    This document is one of 17 volumes on indigenous Mexican languages and is the result of a project undertaken by the Archivo de Lenguas Indigenas de Mexico. This volume contains information on Trique, an indigenous language of Mexico spoken in San Juan Copala, in the state of Oaxaca. The objective of collecting such a representative sampling of the…

  19. 78 FR 35593 - Special Local Regulation; Christmas Boat Parade, San Juan Harbor; San Juan, PR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-13

    .... SUPPLEMENTARY INFORMATION: Table of Acronyms DHS Department of Homeland Security FR Federal Register NPRM Notice... public dockets in the January 17, 2008, issue of the Federal Register (73, FR 3316). 4. Public Meeting We... Juan, Puerto Rico during the Christmas Boat Parade, a Boat Parade. The event is scheduled to take...

  20. Una Visita al Viejo San Juan (A Visit to Old San Juan).

    ERIC Educational Resources Information Center

    Cabello, Victor; And Others

    Written in Spanish, this black and white illustrated booklet provides a tour of Old San Juan, Puerto Rico's oldest and most historic city. Brief historical information is provided on the Perro de San Jeronimo, a statue of a barking dog found in front of the Castillo; Plaza de Colon, a small plaza dedicated to Christopher Columbus; the Catedral de…

  1. 77 FR 47358 - San Juan National Forest Resource Advisory Committee

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-08

    ... Forest Service San Juan National Forest Resource Advisory Committee AGENCY: Forest Service, USDA. ACTION: Notice of meeting. SUMMARY: The San Juan National Forest Resource Advisory Council (RAC) will meet in... recommendations to the Forest Service concerning projects and funding consistent with Title II of the Act....

  2. Juan's Dilemma: A New Twist on the Old Lemon Battery

    ERIC Educational Resources Information Center

    Hunt, Vanessa; Sorey, Timothy; Balandova, Evguenia; Palmquist, Bruce

    2010-01-01

    When life hands you lemons, make a battery! In this article, the authors describe an activity they refer to as "Juan's Dilemma," an extension of the familiar lemon-battery activity (Goodisman 2001). Juan's Dilemma integrates oxidation and reduction chemistry with circuit theory in a fun, real-world exercise. The authors designed this activity for…

  3. Source rock maturation, San Juan sag

    SciTech Connect

    Gries, R.R.; Clayton, J.L.

    1989-09-01

    Kinetic modeling for thermal histories was simulated for seven wells in the San Juan sag honoring measured geochemical data. Wells in the area of Del Norte field (Sec. 9, T40N, R5E), where minor production has been established from an igneous sill reservoir, show that the Mancos Shale source rocks are in the mature oil generation window as a combined result of high regional heat flow and burial by approximately 2,700 m of Oligocene volcanic rocks. Maturation was relatively recent for this area and insignificant during Laramide subsidence. In the vicinity of Gramps field (Sec. 24, T33N, R2E) on the southwest flank of the San Juan sag, these same source rocks are exposed due to erosion of the volcanic cover but appear to have undergone a similar maturation history. At the north and south margins of the sag, two wells (Champlin 34A-13, Sec. 13, T35N, R4.5E; and Champlin 24A-1, Sec. 1, T44N, R5E) were analyzed and revealed that although the regional heat flow was probably similar to other wells, the depth of burial was insufficient to cause maturation (except where intruded by thick igneous sills that caused localized maturation). The Meridian Oil 23-17 South Fork well (Sec. 17, T39N, R4E) was drilled in a deeper part of the San Juan sag, and source rocks were intruded by numerous igneous sills creating a complex maturation history that includes overmature rocks in the lowermost Mancos Shale, possible CO{sub 2} generation from the calcareous Niobrara Member of the Mancos Shale, and mature source rocks in the upper Mancos Shale.

  4. 33 CFR 165.776 - Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01 false Security Zone; Coast Guard Base... Guard District § 165.776 Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico. (a.... Coast Guard or U.S. naval vessels. (c) Regulations. (1) No person or vessel may enter into the...

  5. 33 CFR 165.776 - Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Security Zone; Coast Guard Base... Guard District § 165.776 Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico (a.... Coast Guard or U.S. naval vessels. (c) Regulations. (1) No person or vessel may enter into the...

  6. 33 CFR 165.776 - Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01 false Security Zone; Coast Guard Base... Guard District § 165.776 Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico (a.... Coast Guard or U.S. naval vessels. (c) Regulations. (1) No person or vessel may enter into the...

  7. 33 CFR 165.776 - Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Security Zone; Coast Guard Base... Guard District § 165.776 Security Zone; Coast Guard Base San Juan, San Juan Harbor, Puerto Rico (a.... Coast Guard or U.S. naval vessels. (c) Regulations. (1) No person or vessel may enter into the...

  8. Bioaccumulation of lead, copper, iron, and zinc by fish in a transect of the Santa Catarina River in Cadereyta Jimenez, Nuevo Leon, Mexico

    SciTech Connect

    Not Available

    1986-09-01

    Changes have been observed in the ichthyic species community, upriver in the San Juan River in Nuevo Leon, Mexico. A disappearance of Notropis amabilis, Notropis stramineus, Dionda episcopa and Campostoma anomalum and an increased mortality of Astyanax mexicanus, Lepomis macrochirus and Cichlasoma cyanoguttatum have been found. These changes were probably due to industrial and domestic discharges which produced high levels of lead, copper, iron and detergents in the water. The investigation reported here was done in order to detect the possible presence of lead, copper, iron and zinc in the river waters and also, to determine a probable bioaccumulation of these metals in fish species of the Santa Catarina River in the state of Nuevo Leon in northeastern Mexico, since this river transports domestic and industrial wastes of urban and suburban zones.

  9. Model Simulations of Waves in Hurricane Juan

    NASA Astrophysics Data System (ADS)

    Perrie, W.; Toulany, B.; Padilla-Hernandez, R.; Hu, Y.; Smith, P.; Zhang, W.; Zou, Q.; Ren, X.

    2004-05-01

    Hurricane Juan made landfall at 0300 UTC near Halifax Nova Scotia. This was a category 2 hurricane with winds of 44 m/s, the largest storm to pass over these coastal areas in several decades. Associated high ocean waves were experienced in coastal waters, from Peggy's Cove to Sheet Harbour, growing to epic proportions on the Scotian Shelf, and exceeding the 100-year return wave based on the present climatology. As part of the GoMOOS program (Gulf of Maine Ocean Observing System, www.gomoos.org), winds from the USA Navy COAMPS (Coupled Ocean Atmosphere Model Prediction System) were used to evaluate and compare three widely-used third generation numerical wave models, SWAN, WAM and WaveWatch-III (hereafter WW3) for accuracy, with in situ measurements. Model comparisons consist of a set of composite model systems, respectively nesting WAM, WW3 and SWAN in WAM and WW3. We report results from the intermediate-resolution grid for Hurricane Juan. Wave measurements were made using four operational deep-water buoys (C44258, C44142, C44137, 44005), by a conventional directional wave rider (DWR) moored offshore from Lunenburg Bay, and also by two acoustic Doppler current profiler (ADCP) located (1) near an oil rig on Sable Island Bank, in relatively shallow water, and (2) near the outer boundary of Lunenburg Bay. We discuss the reliability of DWR wave data compared to ADCP wave data. We show that all models provide reliable hindcasts for significant wave height (Hs) and for peak period (Tp) for Juan, although a clear under-estimation of Hs at the peak of the storm is evident, compared to observations. A feature in the COAMPS storm simulation is that the storm track appears to be slightly to the east of that of Quikscat scatterometer data. Comparisons between models and 2-dimensional wave spectra are presented. Preliminary results suggest that the recently released upgrade to the WW3 model shows slightly enhanced skill compared to the other models.

  10. Utility of San Juan basin silcretes

    SciTech Connect

    Gassaway, J.S. )

    1989-09-01

    Silcretes are silicified paleosols that formed as part of deep-weathering profiles during depositional hiatuses under humid climatic regimes. They provide chronostratigraphic support for hypotheses regarding local and regional tectonic and surface events. Silcrete occurs in the San Juan basin (SJB), near the top of the Kirtland Shale (Cretaceous), in the Ojo Alamo Sandstone (Paleocene), and in the Nacimiento Formation (Paleocene). These occurrences mark the southern limit of a 1,000 mi-long, discontinuous outcrop of silcrete discovered during reconnaissance of 16 Western Interior basins. These silcretes, common in Upper Cretaceous to middle Paleocene rocks, are rare in older and younger rocks. Recognition of silcrete occurrences may prove useful to field geologists where other chronostratigraphic information is absent. For example, geologists searching for the K-T boundary could use the lowest silcrete as a starting point.

  11. Availability of hydrologic data in San Juan County, New Mexico

    USGS Publications Warehouse

    Klausing, R.L.; Welder, G.E.

    1984-01-01

    San Juan County, in the northwestern corner of New Mexico, uses surface water from the San Juan, Animas, and La Plata Rivers as a principal source of water for the county, but the water in these streams is fully appropriated. Ground water is present in San Juan County in several bedrock formations and in the alluvium of the river valleys. This report describes the hydrologic data that have been collected in San Juan County, presents examples of the data, shows the locations of the data-collection sites, and indicates where more complete records may be obtained. This data base should be helpful in assessing the quantity, quality, and availability of the county 's water resources. Information collected at 1,877 water wells, 39 streamflow-gaging stations, and 172 springs is presented. The collection sites and geology are shown on a base map with a scale of 1 inch = 2 miles. (USGS).

  12. SAN JUAN BAY ESTUARY PROGRAM IMPLEMENTATION REVIEW ATTACHMENTS

    EPA Science Inventory

    A compilation of attachments referenced in the San Juan Bay Estuary Program Implementation Review (2004). Materials include, entity reports, water and sediment quality action plans, progress reports, correspondence with local municipalities and Puerto Rican governmental agencies,...

  13. Curiosity --El nuevo robot explorador de Marte

    NASA Video Gallery

    El nuevo Laboratorio Científico de Marte llamado Curiosity tiene grandes preguntas que responder una vez que llegue a Marte. Infórmese sobre la misión con el analista de trayectoria de la NASA Fern...

  14. Hydrothermal Vents of Juan de Fuca Ridge

    NASA Astrophysics Data System (ADS)

    Stark, Joyce

    As a member of REVEL (Research and Education: Volcanoes, Exploration and Life), I had an opportunity to participant in a scientific research cruise focused on the active volcanoes along the Juan de Fuca Ridge, the submarine spreading center off the Washington- Oregon-Canada coast. REVEL was sponsored by the National Science Foundation, University of Washington, Pennsylvania State University and the American Museum of Natural History. We studied the geological, chemical and biological processes associated with active hydrothermal systems and my research focused on the biological communities of the sulfide structures. We worked on board the Woods Hole Oceanographic Institution Vessel, R/V Atlantis and the submersible ALVIN was used to sample the "Black Smokers". As a member of the scientific party, I participated in collection and sorting of biological specimens from the vent communities, attended lectures by scientists, contributed to the cruise log website, maintained a journal and developed my own research project. It was my responsibility to bring this cutting-edge research back to the classroom.

  15. The Forts of Old San Juan: Guardians of the Caribbean. Teaching with Historic Places.

    ERIC Educational Resources Information Center

    Weltzin, Rosanna

    The massive masonry defenses of Old San Juan, Puerto Rico, which were begun in the 16th century, exist today as the oldest European-style fortifications within the territory of the United States. This lesson is based on the World Heritage Site nomination file and the National Park Service Handbook, "San Juan: The Forts of Old San Juan." The lesson…

  16. 33 CFR 110.74c - Bahia de San Juan, PR.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Bahia de San Juan, PR. 110.74c... ANCHORAGE REGULATIONS Special Anchorage Areas § 110.74c Bahia de San Juan, PR. The waters of San Antonio Channel, Bahia de San Juan, eastward of longitude 66°05′45″ W....

  17. LOD First Estimates In 7406 SLR San Juan Argentina Station

    NASA Astrophysics Data System (ADS)

    Pacheco, A.; Podestá, R.; Yin, Z.; Adarvez, S.; Liu, W.; Zhao, L.; Alvis Rojas, H.; Actis, E.; Quinteros, J.; Alacoria, J.

    2015-10-01

    In this paper we show results derived from satellite observations at the San Juan SLR station of Felix Aguilar Astronomical Observatory (OAFA). The Satellite Laser Ranging (SLR) telescope was installed in early 2006, in accordance with an international cooperation agreement between the San Juan National University (UNSJ) and the Chinese Academy of Sciences (CAS). The SLR has been in successful operation since 2011 using NAOC SLR software for the data processing. This program was designed to calculate satellite orbits and station coordinates, however it was used in this work for the determination of LOD (Length Of Day) time series and Earth Rotation speed.

  18. Ladrillo and Tales of Juan Bobo: Puerto Rican Folk Tales.

    ERIC Educational Resources Information Center

    Matos, Reinaldo; Matos, Ana

    These two illustrated elementary readers contain the Spanish and English versions of the Puerto Rican folk tales, "Ladrillo" and "Cuentos de Juan Bobo." They are part of a series of reading materials for elementary-level migrant children. These materials are intended to help the child relate to his culture, develop interest in knowing about it and…

  19. THE STRAIT OF JUAN DE FUCA INTERTIDAL AND SUBTIDAL BENTHOS

    EPA Science Inventory

    This report presents the second year results of an intertidal and shallow subtidal benthic sampling program at ten sites along the Washington State coast of the Strait of Juan de Fuca. The purpose of this program was to provide a quantitative characterization of the marine, shall...

  20. Local Control and Self-Determination: The San Juan Case.

    ERIC Educational Resources Information Center

    Garman, Keats; Jack, Donald

    Rapidly increasing Navajo enrollment in San Juan County, Utah, public schools in the 1960's forced the rural school district to improve educational services to a sizable Navajo population while attempting to preserve local control in the face of changing Indian self-determination policy. The district implemented a Curriculum Development Center, a…

  1. Television Viewing Habits of San Juan Students Related to Achievement.

    ERIC Educational Resources Information Center

    Housden, Theresa

    This paper summarizes research on the effects of television viewing on student achievement. Information concerning students in the San Juan Unified School District in California is highlighted. Studies have revealed that: (1) watching more than 3 hours of television a day prevents students from engaging in other activities; (2) moderate television…

  2. SAN JUAN BAY ESTUARY, COMPREHENSIVE CONSERVATION AND MANAGEMENT PLAN

    EPA Science Inventory

    This Comprehensive Conservation and Management Plan (CCMP) contains information about the overall health of the San Juan Bay Estuary (SJBE) as well as proposed solutions to identified problems. These solutions, or Action Plans, are the result of a more than 4-year process of cons...

  3. Offshore finfish mariculture in the Strait of Juan de Fuca

    SciTech Connect

    Rensel, Jack; Kiefer, Dale; Forster, John R.; Woodruff, Dana L.; Evans, Nathan R.

    2007-10-07

    Finfish mariculture has existed in the U.S. Pacific Northwest for over thirty years, but for the past 15 years most effort has focused on culture of Atlantic salmon in protected, inshore cage sites. The Strait of Juan de Fuca (the "Strait") is a large area with relatively sparce shoreline development and several apparent advantages for mariculture using offshore technology.

  4. San Juan College Task Force on Innovation 1995 Report.

    ERIC Educational Resources Information Center

    Moore, Nelle

    In fall 1994, San Juan College, in New Mexico, established the Task Force on Innovation to examine changes in the paradigm of education and how those changes might affect the college. The Task Force determined that the primary driver of change in education was technology, and specifically the increasing number of means and ease of access to…

  5. Recent movements of the Juan de Fuca Plate System

    NASA Astrophysics Data System (ADS)

    1984-08-01

    Analysis of the magnetic anomalies of the Juan de Fuca plate system allows instantaneous poles of rotation relative to the Pacific plate to be calculated from 7 Ma to the present. By combining these with global solutions for Pacific America and ``absolute'' (relative to hot spot) motions, a plate motion sequence can be constructed. This sequence shows that both absolute motions and motions relative to America are characterized by slower velocities where younger and more buoyant material enters the convergence zone: ``pivoting subduction.'' The resistance provided by the youngest portion of the Juan de Fuca plate apparently resulted in its detachment at 4 Ma as the independent Explorer plate. In relation to the hot spot framework, this plate almost immediately began to rotate clockwise around a pole close to itself such that its translational movement into the mantle virtually ceased. After 4 Ma the remainder of the Juan de Fuca plate adjusted its motion in response to the fact that the youngest material entering the subduction zone was not to the south. Differences in seismicity and recent uplift between northern and southern Vancourver Island may reflect a distinction in tectonic style between the ``normal'' subduction of the Juan de Fuca plate to the south and a complex ``underplating occurring as the Explorer plate is overridden by the continent. The history of the Explorer plate may exemplify the conditins under which the self-driving forces of small subducting plates are overcome by the influence of larger, adjacent plates. The recent rapid migration of the absolute pole of rotation of the Juan de Fuca plate toward the plate suggests that it, too, may be nearing this condition.

  6. Recent movements of the Juan de Fuca Plate System

    NASA Astrophysics Data System (ADS)

    Riddihough, Robin

    1984-08-01

    Analysis of the magnetic anomalies of the Juan de Fuca plate system allows instantaneous poles of rotation relative to the Pacific plate to be calculated from 7 Ma to the present. By combining these with global solutions for Pacific/America and "absolute" (relative to hot spot) motions, a plate motion sequence can be constructed. This sequence shows that both absolute motions and motions relative to America are characterized by slower velocities where younger and more buoyant material enters the convergence zone: "pivoting subduction." The resistance provided by the youngest portion of the Juan de Fuca plate apparently resulted in its detachment at 4 Ma as the independent Explorer plate. In relation to the hot spot framework, this plate almost immediately began to rotate clockwise around a pole close to itself such that its translational movement into the mantle virtually ceased. After 4 Ma the remainder of the Juan de Fuca plate adjusted its motion in response to the fact that the youngest material entering the subduction zone was now to the south. Differences in seismicity and recent uplift between northern and southern Vancouver Island may reflect a distinction in tectonic style between the "normal" subduction of the Juan de Fuca plate to the south and a complex "underplating" occurring as the Explorer plate is overridden by the continent. The history of the Explorer plate may exemplify the conditions under which the self-driving forces of small subducting plates are overcome by the influence of larger, adjacent plates. The recent rapid migration of the absolute pole of rotation of the Juan de Fuca plate toward the plate suggests that it, too, may be nearing this condition.

  7. Nuevos Destinos: A CD-ROM for Advanced Beginning Spanish.

    ERIC Educational Resources Information Center

    Blake, Robert J.

    1999-01-01

    Provides a description of the Nuevos Destinos CD-ROM, a joint production for students learning Spanish at the advanced-beginning, intermediate-low, or native-speaker level. Nuevos Destinos involves students in meaningful ways by asking them to solve real-world problems encountered in law offices. (Author/VWL)

  8. Juan Gabriel and audience interpretation. cultural impressions of effeminacy and sexuality in Mexico.

    PubMed

    Sowards, S K

    2000-01-01

    Juan Gabriel's purported effeminacy and sexuality have made him a controversial subject in Mexico, but still loved by fans. Juan Gabriel, by trying to gain acceptance into Mexican society, has become part of a hybrid culture, between the feminine/masculine and homosexual/bisexual/heterosexual groups. This study focuses on interviews with 20 participants who discuss Juan Gabriel's popularity and sexuality. The findings of the study indicate that Juan Gabriel may be considered by his fans to be effeminate, and consequently homosexual. Even though homophobia is widespread in Mexico, Juan Gabriel's fans tend to ignore or exoticize his sexuality, thus affording his success. It is also possible that Juan Gabriel, consciously or not, uses his controversial sexuality as a way to generate popular interest. PMID:10933285

  9. Mineralogy from Cores in Prospect Gulch, San Juan County, Colorado

    USGS Publications Warehouse

    Bove, Dana J.; Johnson, Raymond H.; Yager, Douglas B.

    2007-01-01

    In the late nineteenth century, San Juan County, Colorado, was the center of a metal mining boom in the San Juan Mountains. Although most mining activity ceased by the 1990s, the effects of historical mining continue to contribute metals to ground water and surface water. Previous research by the U.S. Geological Survey identified ground-water discharge as a significant pathway for the loading of metals to surface water from both acid-mine drainage and acid-rock drainage. In an effort to understand the ground-water flow system in the upper Animas River watershed, Prospect Gulch was selected for further study because of the amount of previous data provided in and around that particular watershed. In support of this ground-water research effort, data was collected from drill core, which included: (1) detailed descriptions of the subsurface geology and hydrothermal alteration patterns, (2) depth of sulfide oxidation, and (3) quantitative mineralogy.

  10. Teaching and Communicating Astronomy at Rey Juan Carlos University

    NASA Astrophysics Data System (ADS)

    Hernán-Obispo, M.; Serrano, A.; Aguirre, J.; Martín, P. San

    We present our activities of popularization of Astronomy at Rey Juan Carlos University in Madrid, especially our 30-h workshop for people older than 55 (University for the Elderly) held since the academic year 2002/2003. Our course aims to introduce the basic topics on Astronomy to a group of motivated students who, in most cases, were not able to complete their education in their youth due to the historical environment of Spain in the middle of the twentieth century.

  11. Seismic data acquisition over San Juan volcanic field, San Juan sag, south-central Colorado

    SciTech Connect

    Henkel, R.P. )

    1989-09-01

    The San Juan sag, a foreland basin along the Uncompahgre-Brazos uplift, contains Mesozoic sediments overlain by up to 10,000 ft of Tertiary volcanics. Petroleum exploration beneath thick volcanic cover requires successful acquisition of seismic data; however, experience elsewhere has generally produced only marginal results. Commencing in 1983, Meridian Oil recorded 18 seismic lines comprising 260 mi of conventional and portable data. Noise test were performed at two sites to evaluate seismic response and to determine source and receiver parameters. Vibroseis, shothole, and surface dynamite were examined as sources and gave comparable results. Coherent noise trains with velocities from 4,000 to 8,000 ft/sec and dominant frequencies of 10 to 15 Hz were generated in the Tertiary section. The predominant factor affecting data quality was outcrop lithology. Data recorded over alluvial and other Quaternary deposits tended to be good to fair. Data quality over Tertiary volcanics was variable and highly unit dependent, ranging from fair over andesites and volcaniclastics, poor over ash-flow tuffs, and uniformly very poor over basalts. Seismic source appeared to have only a minor effect on quality. Data processing involved no unusual operations. Velocity filtering was used to suppress near-surface generated coherent noise, Refraction statics were applied to lines with significant elevation or lithologic variations. A successful acquisition program helped to establish the presence of a Mesozoic sedimentary section beneath the volcanics. these data revealed large structural features within the sedimentary section as well as a dramatic angular unconformity at the top of the Cretaceous section.

  12. Hydrologic data from wells at or in the vicinity of the San Juan coal mine, San Juan County, New Mexico

    USGS Publications Warehouse

    Stewart, Anne M.; Thomas, Nicole

    2015-01-01

    In 2010, in cooperation with the Mining and Minerals Division (MMD) of the State of New Mexico Energy, Minerals and Natural Resources Department, the U.S. Geological Survey (USGS) initiated a 4-year assessment of hydrologic conditions at the San Juan coal mine (SJCM), located about 14 miles west-northwest of the city of Farmington, San Juan County, New Mexico. The mine produces coal for power generation at the adjacent San Juan Generating Station (SJGS) and stores coal-combustion byproducts from the SJGS in mined-out surface-mining pits. The purpose of the hydrologic assessment is to identify groundwater flow paths away from SJCM coal-combustion-byproduct storage sites that might allow metals that may be leached from coal-combustion byproducts to eventually reach wells or streams after regional dewatering ceases and groundwater recovers to predevelopment levels. The hydrologic assessment, undertaken between 2010 and 2013, included compilation of existing data. The purpose of this report is to present data that were acquired and compiled by the USGS for the SJCM hydrologic assessment.

  13. 75 FR 62112 - Intent To Prepare an Environmental Impact Statement (EIS) for the San Juan Creek and Tributaries...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-07

    ... channelized for flood risk management and erosion control within the City of San Juan Capistrano. The... lower portions of the watershed along San Juan, Oso and Trabuco Creeks. To address stream bank...

  14. 33 CFR 3.35-25 - Sector San Juan Marine Inspection Zone and Captain of the Port Zone.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Zone and Captain of the Port Zone. 3.35-25 Section 3.35-25 Navigation and Navigable Waters COAST GUARD... CAPTAIN OF THE PORT ZONES Seventh Coast Guard District § 3.35-25 Sector San Juan Marine Inspection Zone and Captain of the Port Zone. Sector San Juan's office is located in San Juan, PR. The boundaries...

  15. 77 FR 61632 - Final Environmental Impact Statement for Cattle Point Road Relocation, San Juan Island National...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-10

    ... National Park Service Final Environmental Impact Statement for Cattle Point Road Relocation, San Juan.... ACTION: Notice of Availability of the Final Environmental Impact Statement for Cattle Point Road... bluff erosion that threatens a segment of the Cattle Point Road located in San Juan Island...

  16. 77 FR 33239 - Prairie Stewardship Plan/Environmental Impact Statement, San Juan Island National Historical Park

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-05

    ... National Park Service Prairie Stewardship Plan/Environmental Impact Statement, San Juan Island National... Impact Statement for Prairie Stewardship Plan, San Juan Island National Historical Park, Washington... Prairie Stewardship Plan, as called for in the 2008 General Management Plan. The Prairie Stewardship...

  17. The Community College-High School Connection. Articulated Programs at San Juan College.

    ERIC Educational Resources Information Center

    Black, Marjorie

    San Juan College in Farmington, New Mexico, has developed articulated programs with the four school districts of San Juan County. Designated an Area Vocational School (AVS) in 1969, the college has successfully operated 10 programs for secondary students. The students enrolled in these programs learn in the same facilities and share equipment with…

  18. A Study of Students Who Dropped Out of San Juan Dstrict.

    ERIC Educational Resources Information Center

    Widmann, Jeffrey C.; Housden, Theresa M.

    In June, 1987, the San Juan (California) Unified School District's Research and Evaluation Department prepared a summary of dropout data available which indicated that San Juan's dropout rate was between 22 and 25 percent over a 3-year period. In the fall of 1987, the department conducted a study of the characteristics of students who had dropped…

  19. 33 CFR 110.229 - Straits of Juan de Fuca, Wash.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Straits of Juan de Fuca, Wash. 110.229 Section 110.229 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY ANCHORAGES ANCHORAGE REGULATIONS Anchorage Grounds § 110.229 Straits of Juan de Fuca, Wash. (a)...

  20. 33 CFR 165.758 - Security Zone; San Juan, Puerto Rico.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Security Zone; San Juan, Puerto Rico. (a) Location. Moving and fixed security zones are established 50... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Security Zone; San Juan, Puerto Rico. 165.758 Section 165.758 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

  1. 33 CFR 110.240 - San Juan Harbor, P.R.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 1 2014-07-01 2014-07-01 false San Juan Harbor, P.R. 110.240 Section 110.240 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY ANCHORAGES ANCHORAGE REGULATIONS Anchorage Grounds § 110.240 San Juan Harbor, P.R. (a) The anchorage...

  2. 33 CFR 110.240 - San Juan Harbor, P.R.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 1 2013-07-01 2013-07-01 false San Juan Harbor, P.R. 110.240 Section 110.240 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY ANCHORAGES ANCHORAGE REGULATIONS Anchorage Grounds § 110.240 San Juan Harbor, P.R. (a) The anchorage...

  3. 78 FR 61958 - San Juan County Historical Society; Notice of Preliminary Determination of A Qualifying Conduit...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-08

    ... Energy Regulatory Commission San Juan County Historical Society; Notice of Preliminary Determination of A..., San Juan County Historical Society filed a notice of intent to construct a qualifying conduit... Historical Society, P.O. Box 154, Silverton, CO 81433, Phone No. (970) 387-5488. FERC Contact: Robert...

  4. 33 CFR 110.240 - San Juan Harbor, P.R.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 1 2012-07-01 2012-07-01 false San Juan Harbor, P.R. 110.240 Section 110.240 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY ANCHORAGES ANCHORAGE REGULATIONS Anchorage Grounds § 110.240 San Juan Harbor, P.R. (a) The anchorage...

  5. 33 CFR 110.240 - San Juan Harbor, P.R.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false San Juan Harbor, P.R. 110.240 Section 110.240 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY ANCHORAGES ANCHORAGE REGULATIONS Anchorage Grounds § 110.240 San Juan Harbor, P.R. (a) The anchorage...

  6. 33 CFR 110.240 - San Juan Harbor, P.R.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 1 2011-07-01 2011-07-01 false San Juan Harbor, P.R. 110.240 Section 110.240 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY ANCHORAGES ANCHORAGE REGULATIONS Anchorage Grounds § 110.240 San Juan Harbor, P.R. (a) The anchorage...

  7. Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction

    NASA Technical Reports Server (NTRS)

    Anderson-Fontana, S.; Larson, R. L.; Engein, J. F.; Lundgren, P.; Stein, S.

    1986-01-01

    Magnetic and bathymetric profiles derived from the R/V Endeavor survey and focal mechanism studies for earthquakes on two of the Juan Fernandez microplate boundaries are analyzed. It is observed that the Nazca-Juan Fernandez pole is in the northern end of the microplate since the magnetic lineation along the East Ridge of the microplate fans to the south. The calculation of the relative motion of the Juan Fernandez-Pacific-Nazca-Antarctic four-plate system using the algorithm of Minster et al. (1974) is described. The development of tectonic and evolutionary models of the region is examined. The tectonic model reveals that the northern boundary of the Juan Fernandez microplate is a zone of compression and that the West Ridge and southwestern boundary are spreading obliquely; the evolutionary model relates the formation of the Juan Fernandez microplate to differential spreading rates at the triple junction.

  8. Pole of rotating analysis of present-day Juan de Fuca plate motion

    NASA Technical Reports Server (NTRS)

    Nishimura, C.; Wilson, D. S.; Hey, R. N.

    1984-01-01

    Convergence rates between the Juan de Fuca and North American plates are calculated by means of their relative, present-day pole of rotation. A method of calculating the propagation of errors in addition to the instantaneous poles of rotation is also formulated and applied to determine the Euler pole for Pacific-Juan de Fuca. This pole is vectorially added to previously published poles for North America-Pacific and 'hot spot'-Pacific to obtain North America-Juan de Fuca and 'hot spot'-Juan de Fuca, respectively. The errors associated with these resultant poles are determined by propagating the errors of the two summed angular velocity vectors. Under the assumption that hot spots are fixed with respect to a mantle reference frame, the average absolute velocity of the Juan de Puca plate is computed at approximately 15 mm/yr, thereby making it the slowest-moving of the oceanic plates.

  9. Sr isotopic variations along the Juan de Fuca Ridge.

    USGS Publications Warehouse

    Eaby, J.; Clague, D.A.; Delaney, J.R.

    1984-01-01

    The Sr isotopic ratios of 39 glass and microcrystalline basalt samples along the Juan de Fuca Ridge and one glass sample from Brown Bear Seamount are at the lower end of the range for normal MORB; the average 87Sr/86Sr ratio is 0.70249 + or - 0.00014 (2sigma ). Although subtle variations exist along the strike of the ridge, the Sr isotopic data do not show systematic variation relative to the proposed Cobb hotspot. The isotopic data are inconsistent with an enriched mantle-plume origin for the Cobb-Eikelberg Seamount chain.-W.H.B.

  10. Urban ecology of Triatoma infestans in San Juan, Argentina.

    PubMed

    Vallvé, S L; Rojo, H; Wisnivesky-Colli, C

    1996-01-01

    This study was performed in an urban neighborhood of the capital city of the province of San Juan, Argentina. Erected as a housing complex, the place consists of 768 flats distributed in buildings of three and seven floors each. A survey was carried out in 33% of the dwellings, enquiring about the number of Triatoma infestans found indoors, stage of the bug development-nymph or adult- and how these insects had entered their homes. Adult T.infestans were found on all floors; 163 people (64%) had found them at least once, and 130 (51%) several times. Dispersal flight seems to have been the main mechanism of infestation by adult bugs in this area, and a total of 51% of the surveyed inhabitants reported that the insects had flown into their flats. PMID:9070399

  11. Central San Juan caldera cluster: regional volcanic framework

    USGS Publications Warehouse

    Lipman, Peter W.

    2000-01-01

    Eruption of at least 8800 km3 of dacitic-rhyolitic magma as 9 major ash-slow sheets (individually 150-5000 km3) was accompanied by recurrent caldera subsidence between 28.3 and about 26.5 Ma in the central San Juan Mountains, Colorado. Voluminous andesitic-decitic lavas and breccias were erupted from central volcanoes prior to the ash-flow eruptions, and similar lava eruptions continued within and adjacent to the calderas during the period of explosive volcanism, making the central San Juan caldera cluster an exceptional site for study of caldera-related volcanic processes. Exposed calderas vary in size from 10 to 75 km in maximum diameter, the largest calderas being associated with the most voluminous eruptions. After collapse of the giant La Garita caldera during eruption if the Fish Canyon Tuff at 17.6 Ma, seven additional explosive eruptions and calderas formed inside the La Garita depression within about 1 m.y. Because of the nested geometry, maximum loci of recurrently overlapping collapse events are inferred to have subsided as much as 10-17 km, far deeper than the roof of the composite subvolcanic batholith defined by gravity data, which represents solidified caldera-related magma bodies. Erosional dissection to depths of as much as 1.5 km, although insufficient to reach the subvolcanic batholith, has exposed diverse features of intracaldera ash-flow tuff and interleaved caldera-collapse landslide deposits that accumulated to multikilometer thickness within concurrently subsiding caldera structures. The calderas display a variety of postcollapse resurgent uplift structures, and caldera-forming events produced complex fault geometries that localized late mineralization, including the epithermal base- and precious-metal veins of the well-known Creede mining district. Most of the central San Juan calderas have been deeply eroded, and their identification is dependent on detailed geologic mapping. In contrast, the primary volcanic morphology of the

  12. CHAMA-SOUTHERN SAN JUAN MOUNTAINS WILDERNESS STUDY AREA, COLORADO.

    USGS Publications Warehouse

    Brock, Maurice R.; Lindquist, Alec E.

    1984-01-01

    A mineral survey of the Chama-southern San Juan Mountains Wilderness study area in Colorado revealed demonstrated coal resources in an area of substantiated coal resource potential and areas of probable resource potential for petroleum and metals including molydenum, copper, zinc, lead, and silver. The coal deposit that underlies the northwestern part of the study area at its westernmost extension requires further study for a more accurate determination of the coal resources that underlie the area. Drilling also is required to determine depth, magnitude, and tenor of the postulated porphyry deposit containing copper and molybdenum in the northernmost part of the study area. Geophysical surveys and detailed geologic mapping in advance of drilling are needed in the areas delineated as having potential for oil and gas resources.

  13. Composition and origin of Nuevo Laredo Trend eucrites

    NASA Astrophysics Data System (ADS)

    Warren, P. H.; Jerde, E. A.

    1987-03-01

    The new bulk-rock analyses reported for the ALHA81001, Lakangaon and Nuevo Laredo eucritic meteorites indicate that the first of these resembles Ibitira in possessing lower Na concentrations than any other eucrite, while the other two are the lowest-Mg/Fe of all eucrites. The present data and those seen in the literature suggest that most of the ostensible Main Group eucrites actually belong to the Nuevo Laredo Trend, which is characterized by limited variations of incompatible element contents despite considerable variations in Mg/(Mg+Fe) ratio and V content.

  14. Sea level Variability and Juan de Fuca Bathymetry

    NASA Astrophysics Data System (ADS)

    Huybers, P. J.; Boulahanis, B.; Proistosescu, C.; Langmuir, C. H.; Carbotte, S. M.; Katz, R. F.

    2015-12-01

    That deglaciation influences mid-ocean ridge volcanism is well established for Iceland, where depressurization associated with melting a ~2 km ice cap led to order of magnitude increases in volcanism during the last deglaciation. The case was also made that the more subtle ~100 m changes in sea level that accompany glacial cycles have identifiable implications for undersea mid-ocean ridge systems using both models and data from the Australian-Antarctic Ridge (Crowley et al., 2015). Sea level rising at ~1 cm/year during deglaciation leads to an expectation of ~10% decreases in melt production at ridges, given mantle upwelling rates of ˜3 cm/yr at intermediate spreading ridges and mantle density being ~3 times that of seawater. The implications of variations in melt production for bathymetry, however, involve numerous considerations, including whether melt signals are cancelled within the melt column, appreciably alter accretionary or fault processes, and have identifiable surface expressions. Further empirical assessment of bathymetry is thus useful for purposes of confirming patterns and constraining processes. Here we report on spectral analyses of bathymetry recently acquired from the Juan de Fuca ridge between 44°30'N and 45°15'N during the SeaVOICE expedition. Multibeam swath sonar data were acquired with an EM122 sonar insonfiying seafloor to crustal ages of ˜2 ma with 35 m spatial resolution. We examine (1.) the statistical significance of concentrations of bathymetric variability at the 100 ky, 41 ky, and 23 ky periods characteristic of late-Pleistocene sea level variability; (2.) whether sea level responses are primarily at 41 ky periods in crust accreted during the early Pleistocene, when global sea level variations were primarily at this period; and (3.) if sea level responses are superimposed on bathymetry variations or, instead, align with fault features. We also note that Juan de Fuca's proximity to the Cordilleran Ice Sheet implies that regional

  15. Juan de Fuca plate: Aseismic subduction at 1. 8 cm/yr

    SciTech Connect

    Acharya, H.

    1981-11-01

    Volcanic activity in the Cascades in historic times suggests that the Juan de Fuca plate is underthrusting aseismically at about 1.8 cm/yr. This rate of underthrusting is identical to the rate computed from sediment studies.

  16. Hydrologic data for the San Juan and Animas River valleys in the Farmington, Aztec, Bloomfield, and Cedar Hill areas, San Juan County, New Mexico

    USGS Publications Warehouse

    McAda, D.P.; Shelton, S.G.

    1987-01-01

    In July 1985, the U.S. Geological Survey initiated a three-year study in San Juan County, New Mexico, to determine the concentrations of chemical constituents in the groundwater in the San Juan and Animas River valleys and to determine the direction and rate of groundwater flow and its relation to river stage. The study was conducted in cooperation with the San Juan County Commission and the New Mexico Oil Conservation Division. The data that was collected during the first 1-1/2 yr of the study is completed. The report includes well records for 51 wells and water levels from 23 wells, hydrographs from four observation wells and one river stage site, and available chemical analyses from 50 wells and 14 surface water sites. Water samples from six wells and one surface-water site were analyzed for purgeable organic chemicals; none were detected. (Lantz-PTT)

  17. Mycobacterium lepromatosis Infections in Nuevo León, Mexico

    PubMed Central

    Escalante-Fuentes, Wendy; Ocampo-Garza, Sonia S.; Ocampo-Candiani, Jorge; Molina-Torres, Carmen A.; Avanzi, Charlotte; Benjak, Andrej; Busso, Philippe; Singh, Pushpendra; Cole, Stewart T.

    2015-01-01

    The frequency of infection caused by the recently described pathogen Mycobacterium lepromatosis is unknown. Here, we describe the demographics, clinical characteristics, and therapeutic outcomes of five lepromatous leprosy patients suffering from M. lepromatosis infection in Nuevo Léon, Mexico. Diagnosis was facilitated by a new highly specific PCR procedure. PMID:25809978

  18. Mycobacterium lepromatosis Infections in Nuevo León, Mexico.

    PubMed

    Vera-Cabrera, Lucio; Escalante-Fuentes, Wendy; Ocampo-Garza, Sonia S; Ocampo-Candiani, Jorge; Molina-Torres, Carmen A; Avanzi, Charlotte; Benjak, Andrej; Busso, Philippe; Singh, Pushpendra; Cole, Stewart T

    2015-06-01

    The frequency of infection caused by the recently described pathogen Mycobacterium lepromatosis is unknown. Here, we describe the demographics, clinical characteristics, and therapeutic outcomes of five lepromatous leprosy patients suffering from M. lepromatosis infection in Nuevo Léon, Mexico. Diagnosis was facilitated by a new highly specific PCR procedure. PMID:25809978

  19. Phylogenetic Analysis of West Nile Virus, Nuevo Leon State, Mexico

    PubMed Central

    Blitvich, Bradley J.; Fernández-Salas, Ildefonso; Contreras-Cordero, Juan F.; Loroño-Pino, María A.; Marlenee, Nicole L.; Díaz, Francisco J.; González-Rojas, José I.; Obregón-Martínez, Nelson; Chiu-García, Jorge A.; Black, William C.

    2004-01-01

    West Nile virus RNA was detected in brain tissue from a horse that died in June 2003 in Nuevo Leon State, Mexico. Nucleotide sequencing and phylogenetic analysis of the premembrane and envelope genes showed that the virus was most closely related to West Nile virus isolates collected in Texas in 2002. PMID:15324558

  20. Project Nuevos Horizontes, 1988-89. OREA Report.

    ERIC Educational Resources Information Center

    Berney, Tomi D.; And Others

    In its fourth year, Project Nuevos Horizontes served 315 limited-English-speaking, native Spanish-speaking students in fall 1988 and 300 in spring 1989. The majority of participants came from the Dominican Republic and Puerto Rico. The program's goal was to provide students with the academic and support services needed to ensure completion of…

  1. Paleocene climate change in the San Juan Basin, New Mexico: A paleosol perspective

    NASA Astrophysics Data System (ADS)

    Hobbs, K.; Fawcett, P. J.

    2012-12-01

    The fluvial Nacimiento Formation in the San Juan Basin, New Mexico, is host to abundant paleosols of early Paleocene age (Danian stage, Puercan/Torrejonian NALMA). Paleosols with vertic properties are common, with less common horizonated clay-rich paleosols and siliceous sandy paleosols. Since paleosols represent under the long-term average state of climate conditions over 102-105 years of pedogenesis, San Juan Basin paleosols are among the most useful proxies for understanding the history of local and regional climate conditions and change in the Paleocene. Here we present geochemical and paleoclimatological interpretations of paleosols from the Nacimiento Formation in the western and southern San Juan Basin; discuss their significance on interpretation of basin sedimentology; and seek possible modern analogues. An interesting and seemingly paradoxical problem in the Paleocene San Juan Basin is the presence of vertic paleosols (typically associated with subhumid to semiarid climates) in close geographic and stratigraphic proximity to well-horizonated or base-poor paleosols and Arecales and Crocodilia fossils (all associated with tropical to subtropical humid climates). Preliminary data show that some San Juan Basin vertic paleosols formed under mean annual temperatures (MAT) of ~12° ± 4.4° C and mean annual precipitation (MAP) amounts of ~1,100 mm. The mineral composition and presence of kaolinite in more horizonated paleosols suggest they formed under warmer and wetter conditions. This study also investigates the silcrete-bearing paleosols of the Nacimiento Formation. Pedogenic silcretes typically form in stable landscapes with subtropical to tropical variable moisture climates. Unlike other Laramide basins where Paleogene hyperthermals often are represented by reddened paleosols, it is possible that hyperthermals are represented by silcretes in the San Juan Basin. Regardless of the pedogenic representation of hyperthermals in the San Juan Basin, the paleosols

  2. Fruit and fertility in San Juan de la Manguana.

    PubMed

    Mckenna, N D

    1995-01-01

    Ana Irsa (Nisoris) Aquina, 39, a mother of seven, grandmother, wife, and voluntary community health facilitator, lives in the Dominican Republic. Nisoris counsels women and their partners about reproductive health, provides child survival information to new mothers, and dispenses common remedies for diarrhea and respiratory infections as well as contraceptives (mainly oral contraceptives and condoms). These supplies are financed by Fundacion para el Desarrollo Communitario (FUDECO), a nongovernmental agency which is a member of the Save the Children alliance. FUDECO's work includes the development of water systems, health services, schools, and soil conservation training. Widespread deforestation in the San Juan area has led to a reduction in self-sufficient farming and a lack of nutrition evidenced by an increase in infant blindness caused by Vitamin A deficiency. To combat this situation, FUDECO has taught the women's group led by Nisoris how to use solar power to dry fruits and vegetables to preserve them for consumption beyond their season. The pilot group has in turn taught six other women's groups and conducted informal product sampling and Vitamin A information sessions in the local market. FUDECO provides supplies and technical expertise. The program has been so successful that the women are exploring packaging options so that they can sell the dried produce. PMID:12290005

  3. San Juan basin faulting - More than meets eye

    SciTech Connect

    Huffman, A.C. Jr.; Taylor, D.J. )

    1989-09-01

    Interpretation of approximately 1,000 mi of seismic lines throughout the San Juan basin, New Mexico, has revealed a rectilinear pattern of high-angle faults with dominant trends of N60-70{degree}W and N30-40{degree}E. Vertical fault separation in the plane of section is commonly 150-250 ft, measured at the top of the basement. Strike-slip movement on many faults is also indicated by the map pattern, but no reliable measurements have yet been made. The authors analysis of the movement history of several faults indicates three significant episodes of movement: Pennsylvanian to Permian, Jurassic to Cretaceous, and early to middle Tertiary. Sense of movement on many of the faults varied episodically so that the present basement offset is actually cumulative offset representing all previous periods of movement. Above Permian strata, actual offset on most faults is not detectable on seismic sections; however, drape and measurable differences in thickness across fault zones are commonly exhibited by Mesozoic rocks.

  4. Map Showing Susceptibility to Earthquake-Induced Landsliding, San Juan Metropolitan Area, Puerto Rico

    USGS Publications Warehouse

    Santiago, Marilyn; Larsen, Matthew C.

    2001-01-01

    Analysis of slope angle and rock type using a geographic information system indicates that about 68 percent of the San Juan metropolitan area has low to no susceptibility to earthquake-induced landslides. This is at least partly due to the fact that 45 percent of the San Juan metropolitan area is constructed on slopes of 3 degrees or less, which are too gentle for landslides to occur. The areas with the highest susceptibility to earthquake-induced landslides account for 6 percent of the surface area. Almost one-quarter (24 percent) of the San Juan metropolitan area is moderately susceptible to earthquake-induced landslides. These areas are mainly in the southern portions of the San Juan metropolitan area, where housing development pressures are currently high because of land availability and the esthetics of greenery and hillside views. The combination of new development and moderate earthquake-induced landslide susceptibility indicate that the southern portions of the San Juan metropolitan area are be at greatest risk.

  5. 33 CFR 334.1180 - Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 3 2012-07-01 2012-07-01 false Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. 334.1180 Section 334.1180 Navigation and Navigable... REGULATIONS § 334.1180 Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. (a)...

  6. 33 CFR 334.1180 - Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 3 2011-07-01 2011-07-01 false Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. 334.1180 Section 334.1180 Navigation and Navigable... REGULATIONS § 334.1180 Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. (a)...

  7. 33 CFR 334.1180 - Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. 334.1180 Section 334.1180 Navigation and Navigable... REGULATIONS § 334.1180 Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. (a)...

  8. 33 CFR 334.1180 - Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 3 2014-07-01 2014-07-01 false Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. 334.1180 Section 334.1180 Navigation and Navigable... REGULATIONS § 334.1180 Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. (a)...

  9. 33 CFR 334.1180 - Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 3 2013-07-01 2013-07-01 false Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. 334.1180 Section 334.1180 Navigation and Navigable... REGULATIONS § 334.1180 Strait of Juan de Fuca, Wash.; air-to-surface weapon range, restricted area. (a)...

  10. 78 FR 28800 - Foreign-Trade Zone 61-San Juan, Puerto Rico; Application for Subzone; Parapiezas Corporation; San...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-16

    ... Foreign-Trade Zones Board Foreign-Trade Zone 61--San Juan, Puerto Rico; Application for Subzone; Parapiezas Corporation; San Juan, Puerto Rico An application has been submitted to the Foreign-Trade Zones Board (the Board) by the Puerto Rico Trade & Export Company, grantee of FTZ 61, requesting...

  11. 75 FR 41819 - Reorganization/Expansion of Foreign-Trade Zone 61 San Juan, Puerto Rico, Area

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-19

    ... Foreign-Trade Zones Board Reorganization/Expansion of Foreign-Trade Zone 61 San Juan, Puerto Rico, Area...), the Foreign-Trade Zones Board (the Board) adopts the following Order: Whereas, the Puerto Rico Trade... (proposed Sites 14, 15 and 16) in the San Juan, Puerto Rico, area within and adjacent to the San...

  12. 33 CFR 162.260 - Channel leading to San Juan Harbor, P.R.; use, administration, and navigation.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Channel leading to San Juan Harbor, P.R.; use, administration, and navigation. 162.260 Section 162.260 Navigation and Navigable... WATERWAYS NAVIGATION REGULATIONS § 162.260 Channel leading to San Juan Harbor, P.R.; use,...

  13. 33 CFR 162.260 - Channel leading to San Juan Harbor, P.R.; use, administration, and navigation.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01 false Channel leading to San Juan Harbor, P.R.; use, administration, and navigation. 162.260 Section 162.260 Navigation and Navigable... WATERWAYS NAVIGATION REGULATIONS § 162.260 Channel leading to San Juan Harbor, P.R.; use,...

  14. 33 CFR 162.260 - Channel leading to San Juan Harbor, P.R.; use, administration, and navigation.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01 false Channel leading to San Juan Harbor, P.R.; use, administration, and navigation. 162.260 Section 162.260 Navigation and Navigable... WATERWAYS NAVIGATION REGULATIONS § 162.260 Channel leading to San Juan Harbor, P.R.; use,...

  15. 33 CFR 162.260 - Channel leading to San Juan Harbor, P.R.; use, administration, and navigation.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Channel leading to San Juan Harbor, P.R.; use, administration, and navigation. 162.260 Section 162.260 Navigation and Navigable... WATERWAYS NAVIGATION REGULATIONS § 162.260 Channel leading to San Juan Harbor, P.R.; use,...

  16. 46 CFR 7.145 - Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 1 2010-10-01 2010-10-01 false Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA. 7.145 Section 7.145 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES APPLICABLE TO THE PUBLIC BOUNDARY LINES Pacific Coast § 7.145 Strait of Juan de Fuca, Haro Strait and...

  17. The Juan non-LTR retrotransposon in mosquitoes: genomic impact, vertical transmission and indications of recent and widespread activity

    PubMed Central

    Biedler, James K; Tu, Zhijian

    2007-01-01

    Background In contrast to DNA-mediated transposable elements (TEs), retrotransposons, particularly non-long terminal repeat retrotransposons (non-LTRs), are generally considered to have a much lower propensity towards horizontal transfer. Detailed studies on site-specific non-LTR families have demonstrated strict vertical transmission. More studies are needed with non-site-specific non-LTR families to determine whether strict vertical transmission is a phenomenon related to site specificity or a more general characteristic of all non-LTRs. Juan is a Jockey clade non-LTR retrotransposon first discovered in mosquitoes that is widely distributed in the mosquito family Culicidae. Being a non-site specific non-LTR, Juan offers an opportunity to further investigate the hypothesis that non-LTRs are genomic elements that are primarily vertically transmitted. Results Systematic analysis of the ~1.3 Gbp Aedes aegypti (Ae. aegypti) genome sequence suggests that Juan-A is the only Juan-type non-LTR in Aedes aegypti. Juan-A is highly reiterated and comprises approximately 3% of the genome. Using minimum cutoffs of 90% length and 70% nucleotide (nt) identity, 663 copies were found by BLAST using the published Juan-A sequence as the query. All 663 copies are at least 95% identical to Juan-A, while 378 of these copies are 99% identical to Juan-A, indicating that the Juan-A family has been transposing recently in evolutionary history. Using the 0.34 Kb 5' UTR as the query, over 2000 copies were identified that may contain internal promoters, leading to questions on the genomic impact of Juan-A. Juan sequences were obtained by PCR, library screening, and database searches for 18 mosquito species of six genera including Aedes, Ochlerotatus, Psorophora, Culex, Deinocerites, and Wyeomyia. Comparison of host and Juan phylogenies shows overall congruence with few exceptions. Conclusion Juan-A is a major genomic component in Ae. aegypti and it has been retrotransposing recently in

  18. A jewel in the desert: BHP Billiton's San Juan underground mine

    SciTech Connect

    Buchsbaum, L.

    2007-12-15

    The Navajo Nation is America's largest native American tribe by population and acreage, and is blessed with large tracks of good coal deposits. BHP Billiton's New Mexico Coal Co. is the largest in the Navajo regeneration area. The holdings comprise the San Juan underground mine, the La Plata surface mine, now in reclamation, and the expanding Navajo surface mine. The article recounts the recent history of the mines. It stresses the emphasis on sensitivity to and helping to sustain tribal culture, and also on safety. San Juan's longwall system is unique to the nation. It started up as an automated system from the outset. Problems caused by hydrogen sulfide are being tackled. San Juan has a bleederless ventilation system to minimise the risk of spontaneous combustion of methane and the atmospheric conditions in the mine are heavily monitored, especially within the gob areas. 3 photos.

  19. Juan de Fuca subducting plate geometry and intraslab seismicity

    NASA Astrophysics Data System (ADS)

    Medema, Guy Frederick

    The geometry of the subducting Juan de Fuca plate beneath the Olympic Peninsula of Western Washington is modeled using wide-angle P mP reflections off the slab Moho. Active-source reflection data collected from the 1998 WET SHIPS project were augmented with earthquake-source reflections to increase the spatial distribution of reflection points over the Juan de Fuca arch structure. Approximately 1100 WET SHIPS and 500 earthquake-source reflections were used in our inversion. PmP travel-times from active sources and PmP--P differential times from earthquakes sources were simultaneously inverted for slab-Moho depth, using a combination of finite-difference and 3-D ray-tracing methods. Results show a tighter arch structure than in previous models with the shallowest dipping portion (˜ 10° dip) concentrated directly beneath the Olympic Mountains. Comparison of our slab model to intraslab earthquake hypocenters reveals a southwest-northeast trending lineament of seismicity situated just beneath the subducted Moho in the slab mantle. We interpret this seismicity as the manifestation of a subducting pseudofault along which high levels of upper mantle hydration occurred prior to subduction. Most of the remaining intraslab seismicity is concentrated on the northern and southern flanks of the arch and is likely due to increased strain rates in these regions from the combined effect of slab arch and subsequent steepening of slab dip. Earthquakes in the northern region appear to occur above the slab Moho in the crust of the oceanic plate, while uncertainties in earthquake locations and 3-D velocities in the southern region prevent an unambiguous interpretation at this time. The southern patch is especially important as it contains 3 large (magnitude 6.5 to 7.1) earthquakes during that past 60 years, including the 2001, Mw 6.8, Nisqually earthquake. Earthquakes occurring between 45 and 65 km depth in these two regions also systematically produce an anomalous low

  20. Estuarine versus transient flow regimes in Juan de Fuca Strait

    NASA Astrophysics Data System (ADS)

    Thomson, Richard E.; MiháLy, Steven F.; Kulikov, Evgueni A.

    2007-09-01

    Residual currents in Juan de Fuca Strait are observed to switch between two fundamental states: estuarine and transient. The estuarine regime, which prevails roughly 90% of the time in summer and 55% of the time in winter, has a fortnightly modulated, three-layer structure characterized by strong (˜50 cm s-1) outflow above 60 ± 15 m depth, moderate (˜25 cm s-1) inflow between 60 and 125 m depth, and weak (˜10 cm s-1) inflow below 125 ± 10 m depth. Rotation increases the upper layer depth by 40 m on the northern side of the channel and upwelling-favorable coastal winds augment inflow in the bottom layer by as much as 5 cm s-1. Rotation, combined with modulation of the estuarine currents by tidal mixing in the eastern strait, leads to fortnightly variability in the along-channel velocity and cross-channel positioning of the core flow regions. Transient flows, which occur roughly 10% of the time in summer and 45% of the time in winter, are rapidly evolving, horizontally and vertically sheared "reversals" in the estuarine circulation generated during poleward wind events along the outer coast. Major events can persist for several weeks, force a net inward transport, and give rise to an O(10) km wide, surface-intensified, O(100) cm s-1 inflow along the southern (Olympic Peninsula) boundary of the strait. This "Olympic Peninsula Countercurrent" is typically accompanied by an abrupt decrease in salinity, indicating that it is a buoyancy flow originating with low-density water on the northern Washington shelf.

  1. Meteorologically Driven Simulations of Dengue Epidemics in San Juan, PR.

    PubMed

    Morin, Cory W; Monaghan, Andrew J; Hayden, Mary H; Barrera, Roberto; Ernst, Kacey

    2015-08-01

    Meteorological factors influence dengue virus ecology by modulating vector mosquito population dynamics, viral replication, and transmission. Dynamic modeling techniques can be used to examine how interactions among meteorological variables, vectors and the dengue virus influence transmission. We developed a dengue fever simulation model by coupling a dynamic simulation model for Aedes aegypti, the primary mosquito vector for dengue, with a basic epidemiological Susceptible-Exposed-Infectious-Recovered (SEIR) model. Employing a Monte Carlo approach, we simulated dengue transmission during the period of 2010-2013 in San Juan, PR, where dengue fever is endemic. The results of 9600 simulations using varied model parameters were evaluated by statistical comparison (r2) with surveillance data of dengue cases reported to the Centers for Disease Control and Prevention. To identify the most influential parameters associated with dengue virus transmission for each period the top 1% of best-fit model simulations were retained and compared. Using the top simulations, dengue cases were simulated well for 2010 (r2 = 0.90, p = 0.03), 2011 (r2 = 0.83, p = 0.05), and 2012 (r2 = 0.94, p = 0.01); however, simulations were weaker for 2013 (r2 = 0.25, p = 0.25) and the entire four-year period (r2 = 0.44, p = 0.002). Analysis of parameter values from retained simulations revealed that rain dependent container habitats were more prevalent in best-fitting simulations during the wetter 2010 and 2011 years, while human managed (i.e. manually filled) container habitats were more prevalent in best-fitting simulations during the drier 2012 and 2013 years. The simulations further indicate that rainfall strongly modulates the timing of dengue (e.g., epidemics occurred earlier during rainy years) while temperature modulates the annual number of dengue fever cases. Our results suggest that meteorological factors have a time-variable influence on dengue transmission relative to other important

  2. Meteorologically Driven Simulations of Dengue Epidemics in San Juan, PR

    PubMed Central

    Morin, Cory W.; Monaghan, Andrew J.; Hayden, Mary H.; Barrera, Roberto; Ernst, Kacey

    2015-01-01

    Meteorological factors influence dengue virus ecology by modulating vector mosquito population dynamics, viral replication, and transmission. Dynamic modeling techniques can be used to examine how interactions among meteorological variables, vectors and the dengue virus influence transmission. We developed a dengue fever simulation model by coupling a dynamic simulation model for Aedes aegypti, the primary mosquito vector for dengue, with a basic epidemiological Susceptible-Exposed-Infectious-Recovered (SEIR) model. Employing a Monte Carlo approach, we simulated dengue transmission during the period of 2010–2013 in San Juan, PR, where dengue fever is endemic. The results of 9600 simulations using varied model parameters were evaluated by statistical comparison (r2) with surveillance data of dengue cases reported to the Centers for Disease Control and Prevention. To identify the most influential parameters associated with dengue virus transmission for each period the top 1% of best-fit model simulations were retained and compared. Using the top simulations, dengue cases were simulated well for 2010 (r2 = 0.90, p = 0.03), 2011 (r2 = 0.83, p = 0.05), and 2012 (r2 = 0.94, p = 0.01); however, simulations were weaker for 2013 (r2 = 0.25, p = 0.25) and the entire four-year period (r2 = 0.44, p = 0.002). Analysis of parameter values from retained simulations revealed that rain dependent container habitats were more prevalent in best-fitting simulations during the wetter 2010 and 2011 years, while human managed (i.e. manually filled) container habitats were more prevalent in best-fitting simulations during the drier 2012 and 2013 years. The simulations further indicate that rainfall strongly modulates the timing of dengue (e.g., epidemics occurred earlier during rainy years) while temperature modulates the annual number of dengue fever cases. Our results suggest that meteorological factors have a time-variable influence on dengue transmission relative to other important

  3. Laramide tectonic evolution of San Juan sag, Colorado: Implications of Animas and Blanco basin formations

    SciTech Connect

    Brister, B.S. )

    1989-09-01

    The lower member of the Animas Formation (McDermott Member) is a volcaniclastic sequence derived from a north-northwest source (San Juan-La Plata area). It consists of purple andesitic debris flows, green fan-delta sandstones and mud rocks, and dark gray conglomerates with clast compositions indicating that the Precambrian core of the source uplift was exposed. The upper member is a sand-dominated alluvial plain sequence deposited by southwest-flowing braided streams. It includes green-gray-brown carbonaceous mudstones and pebbly sandstones containing clasts of mudstone, andesite, and detritus from Precambrian and Mesozoic sources in the Brazos-San Luis uplift to the east and northeast. by the end of Animas deposition, the San Juan sag (then a northeastern extension of the San Juan basin) was a broad, southwest-plunging synclinal downwarp bounded by hogback monoclines to the north and east. An erosional period followed Animas deposition; the greatest thickness of Animas was preserved along the axis of this synclinal feature. Bright-red sandy mudstones and yellow-gray pebbly sandstones and cobble conglomerates comprise the proximal alluvial-fan deposits of the Blanco Basin Formation. They unconformably overlie Precambrian through Paleocene rocks and clast compositions reflect these sources. Renewed uplift and segmentation of the Brazos-San Luis uplift resulted in the shedding of detritus southwestward into the San Juan sag and eastward into a narrow, asymmetrical, north-trending wrench basin within the uplift. Following Blanco Basin deposition, the last Laramide event is represented by the separation of the San Juan sag from the San Juan basin by uplift of the Archuleta anticlinorium.

  4. SPM4: The Yale/San-Juan Southern Proper Motion Survey: 100 million absolute proper motions

    NASA Astrophysics Data System (ADS)

    van Altena, W. F.

    2011-10-01

    The Yale/San Juan Southern Proper Motion SPM4 Catalog is the culmination of a highly successful 47-year collaboration between the National University of San Juan (UNSJ) and the Yale Southern Observatory (YSO). The SPM4 Catalog contains absolute proper motions, celestial coordinates, blue and visual passband photometry for 103 million stars and galaxies between the south celestial pole and δ=-20°. The Catalog is roughly complete to V = 17.5 and the precision of its positions and absolute proper motions is approximately 30 to 150 mas and 2 to 10 mas yr^{-1}, respectively.

  5. [Dietary prescriptions for the elites of the kingdom of Navarre in the 16th century: the cases of Juan Rena and Juan de Alarcón].

    PubMed

    Serrano Larráyoz, Fernando

    2014-01-01

    The aim of this article is to present and analyse four dietary prescriptions from the 16th century prepared for Juan Rena, a cleric of Venetian origin, and his servant Juan de Alarcón, which are kept at the Archivo General de Navarra. These documents demonstrate the interest of the patients and physicians in dietetics, understood as a group of health and hygienic measures based on the Galenic res naturales and res non naturales. These four prescriptions are closely related to the ad personam or consilia health regimens, which represent a genre of medical literature whose significance in Renaissance Spain has received little attention. The cases studied reveal the high esteem in which the elites held the possession of therapeutic resources adapted to their individual needs, which were compiled and copied for personal use. PMID:24987786

  6. Hydrothermal circulation within the Endeavour Segment, Juan de Fuca Ridge

    NASA Astrophysics Data System (ADS)

    Johnson, H. Paul; Tivey, Maurice A.; Bjorklund, Tor A.; Salmi, Marie S.

    2010-05-01

    Areas of the seafloor at mid-ocean ridges where hydrothermal vents discharge are easily recognized by the dramatic biological, physical, and chemical processes that characterize such sites. Locations where seawater flows into the seafloor to recharge hydrothermal cells within the crustal reservoir are by contrast almost invisible but can be indirectly identified by a systematic grid of conductive heat flow measurements. An array of conductive heat flow stations in the Endeavour axial valley of the Juan de Fuca Ridge has identified recharge zones that appear to represent a nested system of fluid circulation paths. At the scale of an axial rift valley, conductive heat flow data indicate a general cross-valley fluid flow, where seawater enters the shallow subsurface crustal reservoir at the eastern wall of the Endeavour axial valley and undergoes a kilometer of horizontal transit beneath the valley floor, finally exiting as warm hydrothermal fluid discharge on the western valley bounding wall. Recharge zones also have been identified as located within an annular ring of very cold seafloor around the large Main Endeavour Hydrothermal Field, with seawater inflow occurring within faults that surround the fluid discharge sites. These conductive heat flow data are consistent with previous models where high-temperature fluid circulation cells beneath large hydrothermal vent fields may be composed of narrow vertical cylinders. Subsurface fluid circulation on the Endeavour Segment occurs at various crustal depths in three distinct modes: (1) general east to west flow across the entire valley floor, (2) in narrow cylinders that penetrate deeply to high-temperature heat sources, and (3) supplying low-temperature diffuse vents where seawater is entrained into the shallow uppermost crust by the adjacent high-temperature cylindrical systems. The systematic array of conductive heat flow measurements over the axial valley floor averaged ˜150 mW/m2, suggesting that only about 3% of

  7. Water column hydrothermal plumes on the Juan de Fuca Ridge

    SciTech Connect

    Lupton, J.E. )

    1990-08-10

    Hydrographic surveys on the Juan de Fuca Ridge (JdFR) carried out from 1980 to 1987 show a complex pattern of {sup 3}He and Mn-rich water column plumes produced by venting from several submarine hot spring areas. In the vicinity of Axial Volcano at latitude 46{degree}N, distinct plumes were detected in 1980, 1982, and 1983 with {sup 3}He signatures up to {delta}({sup 3}He) = 64% at {approximately} 1,500 m depth at distances of {approximately} 10 km from the seamount summit. However, the same plumes had no detectable thermal signature, a paradox which is attributed to the high {sup 3}He/heat ratios and low salinities of the fluids venting within the caldera of Axial Volcano. Profiles directly over the seamount show hydrothermal {sup 3}He in the water column up to 300 m above the caldera floor, with the {sup 3}He signal increasing with depth to very high and uniform ratios of {delta}({sup 3}He) = 108-150% below the {approximately} 1,500-m caldera sill depth. Another apparent locus of hydrothermal input is Helium Basin, a depression on the northeast flank of Axial Volcano which had {delta}({sup 3}He) = 51% when first sampled in 1980. However, subsequent hydrocasts into Helium Basin in 1982 and 1983 yielded lower helium enrichments, suggesting either a decrease in hydrothermal input or flushing of the basin via a mixing event. To the south of Axial Volcano, high {delta}({sup 3}He) values of {approximately} 40% observed over the ridge axis at 45{degree}18{prime}N and 45{degree}39{prime}N indicate venting on this previously unexplored section of the ridge. The water column plumes over the US Geological Survey vent site at {approximately} 44{degree}40{prime}N on the southern JdFR have very high Mn/{sup 3}He ratios of 4,600 mol/cm{sup 3}, an apparently unique characteristic which can be used to distinguish these plumes from those originating at other JdFR vent fields.

  8. Tiffany Diamonds and Classical Music as Influences on the Performance of "Don Juan in Hell".

    ERIC Educational Resources Information Center

    Johnson, Jim

    This paper analyzes Paul Gregory's 1951 production of "Don Juan in Hell," now considered to be a seminal work in the development of professional and educational readers theatre. The paper contends that the production, which presented a nondramatic work without the usual emphasis on design and spectacle, forced a reexamination of the role of the…

  9. Preliminary data report for the San Juan Basin-Crownpoint surveillance study

    USGS Publications Warehouse

    Frenzel, Peter F.; Craigg, Steven D.; Padgett, Elizabeth T.

    1981-01-01

    Geohydrologic data that may be used to predict the effects of mining on Navajo water resources in the San Juan structural basin are reported as well as the current availability of data from other government agencies. Emphasis is on the vicinity of Crownpoint, New Mexico. (USGS)

  10. Mediated Debate, Historical Framing, and Public Art: The Juan de Onate Controversy in El Paso

    ERIC Educational Resources Information Center

    Perez, Frank G.; Ortega, Carlos F.

    2008-01-01

    In 1988, the El Paso, Texas, city council accepted a proposal to build twelve statues of historically important individuals as part of a downtown revitalization initiative. Juan de Onate was selected as the centerpiece statue of the XII Travelers Memorial of the Southwest. The decision to honor the Spanish colonizer triggered a local controversy…

  11. Geology of the Red House Cliffs area, San Juan County, Utah

    USGS Publications Warehouse

    Mullens, Thomas E.

    1955-01-01

    The Red Cliffs area comprises 296 square miles of canyon and plateau country in southwestern San Juan County, Utah.  The rocks that crop out in the area are mostly deposits of terrestrial environment and are of Permian, Triassic, Jurassic, and Quaternary ages.  The aggregate thickness of these rock is about 3,500 feet.

  12. 75 FR 54377 - Cattle Point Road Relocation; Draft Environmental Impact Statement; San Juan Island National...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-07

    ...Pursuant to the National Environmental Policy Act of 1969 (Pub. L. 91-190, as amended), and the Council on Environmental Quality Regulations (40 CFR part 1500-1508), the National Park Service (NPS), and the Federal Highway Administration (FHWA), Department of Transportation, co-lead agencies for this project, in cooperation with San Juan County, Washington and the Washington State Department......

  13. EFFECTS OF EXPERIMENTAL OILING ON RECOVERY OF STRAIT OF JUAN DE FUCA INTERTIDAL HABITATS

    EPA Science Inventory

    Experimental studies of the effects of Prudhoe Bay crude oil on the recovery of inter-tidal infauna and epifauna were conducted in the Strait of Juan de Fuca region of Washington State. The studies experimentally evaluated the effect of oil treatment, site, substrate type, season...

  14. SYNTHESIS OF BIOLOGICAL DATA FROM THE STRAIT OF JUAN DE FUCA AND NORTHERN PUGET SOUND

    EPA Science Inventory

    This report summarizes the biological data collected during a 5-year research project, titled 'An Environmental Assessment of Northern Puget Sound and the Strait of Juan de Fuca.' This report also incorporates biological data collected during a similar program conducted by the Wa...

  15. Report on Tewa Portion of Trilingual Program at San Juan Elementary School, 1971-1972

    ERIC Educational Resources Information Center

    Speirs, Randall H.

    Guides for teaching oral and written Tewa to American Indian children in grades 1-6 as an integral part of the regular curriculum are presented. In the San Juan Elementary School trilingual program, the time spent teaching Tewa decreases with grade level--from 2 90-minute periods per day for first graders to 2 30-minute classes per week for sixth…

  16. San Juan School Evaluation. Research and Evaluation Report Series No. 27.

    ERIC Educational Resources Information Center

    Bureau of Indian Affairs (Dept. of Interior), Albuquerque, NM.

    The San Juan School (Espanola, New Mexico) was evaluated by a team from the Bureau of Indian Affairs' Central Office staff in Albuquerque. Team members assisted the Division of Program Review as representatives from other divisions, using the expertise in their respective fields. The methodology and techniques, which were left to the evaluator's…

  17. Training for Instructional Uses of Multimedia at San Juan College: Toward the Campus of the Future.

    ERIC Educational Resources Information Center

    Griffiths, John; Degner, Ann

    1995-01-01

    Discusses a multimedia computer-assisted instruction training project at San Juan College (New Mexico) within the context of current research in the area. Research demonstrates that the complexity of hypermedia requires methodical management, cognitive factors limit the optimum number and types of hypermedia link displays, and close monitoring of…

  18. Numerical Simulation of the tidal effects on estuarine circulation in the San Juan Bay

    NASA Astrophysics Data System (ADS)

    Garcia, Edgardo; Canals, Miguel; Capella, Jorge; Morell, Julio; Leonardi, Stefano; Caribbean Coastal Ocean Observing System Collaboration

    2012-11-01

    The regional oceanic modeling system ROMS has been implemented in San Juan Bay, Puerto Rico, to investigate quantitatively the mixing processes and as a forecast tool to support emergency planning and resource management in the area. The response of the San Juan Bay circulation to both river discharges and tidal forcing has been investigated. A hind-cast simulation is performed and compared with time series measurements and hidrographic data to validate the model. Sensitivity studies to turbulence mixing parameterization have been carried out under different forcing scenarios. A simulation without river outflow but forced with tidal constituents along the open boundaries is performed. Good agreement has been found with coastal observations with amplitudes gauges and modeled amplitudes constituents. A numerical experiment of the response of the Bay's circulation to river discharge only is performed and compared with the tide plus river forcing and tidal forcing only scenarios. Salinity distributions and vertical mixing are affected by the proximity to deep waters of the San Juan Bay Estuary, also the bulge region and plume structure in the entrance of San Juan Bay are highly affected by the bottom friction for the case with tide forcing.

  19. 78 FR 18789 - Establishment of the San Juan Islands National Monument

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-03-28

    ... Sig.) Billing code 3295-F3 ] TD28MR13.011 [FR Doc. 2013-07408 Filed 3-27-13; 8:45 am] Billing code... butterfly, once thought to be extinct, is currently limited to a small population in the San Juan...

  20. EVALUATION OF HAZARDOUS WASTE INCINERATION IN CEMENT KILNS AT SAN JUAN CEMENT COMPANY

    EPA Science Inventory

    Cement kiln incineration of chlorinated liquid organic wastes was investigated in a 5-month demonstration program at San Juan Cement Company in Puerto Rico. Chlorinated monocarbon compounds (POHC's) were monitored in the waste and emissions, and the fate of added chlorine in ceme...

  1. RECOVERY OF STRAIT OF JUAN DE FUCA INTERTIDAL HABITAT FOLLOWING EXPERIMENTAL CONTAMINATION WITH OIL

    EPA Science Inventory

    This is a second year interim report on the effects of experimental oiling with Prudhoe Bay crude oil on recovery of intertidal infauna and epifauna of the Strait of Juan de Fuca, Washington State. It describes completed studies of the recovery of infauna as recovery rate relates...

  2. 77 FR 52310 - Expansion of Foreign-Trade Zone 61, San Juan, Puerto Rico

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-29

    ... comment has been given in the Federal Register (76 FR 70703-70704, 11/15/2011) and the application has... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE Foreign-Trade Zones Board Expansion of Foreign-Trade Zone 61, San Juan, Puerto Rico Pursuant to...

  3. Implementing CAI at San Juan College: Toward the Campus of the Future.

    ERIC Educational Resources Information Center

    Griffiths, John B.

    In 1991, a study was conducted at San Juan College (SJC) to examine existing research, issues, and faculty attitudes and needs regarding computer-assisted instruction (CAI). A faculty needs assessment survey was prepared and conducted, a review of the research literature was undertaken, and initial guidelines were drafted for the utilization of…

  4. SAN JUAN BAY ESTUARY PROGRAM COMPREHENSIVE CONSERVATION AND MANAGEMENT PLAN IMPLEMENTATION TRACKING REPORT, 2004

    EPA Science Inventory

    Four years after the approval of its Comprehensive Conservation and Management Plan (CCMP), the San Juan Bay Estuary Program (SJBEP) is working towards the implementation stage of its 49 actions. During the last three years the program has focused its efforts in developing a coll...

  5. 33 CFR 167.1312 - In the Strait of Juan de Fuca: Southern lanes.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...: Southern lanes. 167.1312 Section 167.1312 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Southern lanes. In the southern lanes of the Strait of Juan de Fuca, the following are...′ W 48°10.99′ N 123°24.84′ W (b) A traffic lane for northbound traffic between the separation zone...

  6. 33 CFR 167.1311 - In the Strait of Juan de Fuca: Western lanes.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...: Western lanes. 167.1311 Section 167.1311 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Western lanes. In the western lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for north-westbound traffic. (1) The traffic lane is established between...

  7. 33 CFR 167.1313 - In the Strait of Juan de Fuca: Northern lanes.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...: Northern lanes. 167.1313 Section 167.1313 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Northern lanes. In the northern lanes of the Strait of Juan de Fuca, the following are...′ W (b) A traffic lane for southbound traffic between the separation zone and a line connecting...

  8. 33 CFR 167.1312 - In the Strait of Juan de Fuca: Southern lanes.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...: Southern lanes. 167.1312 Section 167.1312 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Southern lanes. In the southern lanes of the Strait of Juan de Fuca, the following are...′ W 48°10.99′ N 123°24.84′ W (b) A traffic lane for northbound traffic between the separation zone...

  9. 33 CFR 167.1314 - In the Strait of Juan de Fuca: Eastern lanes.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...: Eastern lanes. 167.1314 Section 167.1314 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Eastern lanes. In the eastern lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for westbound traffic between the separation zone and a line connecting...

  10. 33 CFR 167.1311 - In the Strait of Juan de Fuca: Western lanes.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...: Western lanes. 167.1311 Section 167.1311 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Western lanes. In the western lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for north-westbound traffic. (1) The traffic lane is established between...

  11. 33 CFR 167.1313 - In the Strait of Juan de Fuca: Northern lanes.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...: Northern lanes. 167.1313 Section 167.1313 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Northern lanes. In the northern lanes of the Strait of Juan de Fuca, the following are...′ W (b) A traffic lane for southbound traffic between the separation zone and a line connecting...

  12. 33 CFR 167.1313 - In the Strait of Juan de Fuca: Northern lanes.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...: Northern lanes. 167.1313 Section 167.1313 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Northern lanes. In the northern lanes of the Strait of Juan de Fuca, the following are...′ W (b) A traffic lane for southbound traffic between the separation zone and a line connecting...

  13. 33 CFR 167.1311 - In the Strait of Juan de Fuca: Western lanes.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...: Western lanes. 167.1311 Section 167.1311 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Western lanes. In the western lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for north-westbound traffic. (1) The traffic lane is established between...

  14. 33 CFR 167.1314 - In the Strait of Juan de Fuca: Eastern lanes.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...: Eastern lanes. 167.1314 Section 167.1314 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Eastern lanes. In the eastern lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for westbound traffic between the separation zone and a line connecting...

  15. 33 CFR 167.1314 - In the Strait of Juan de Fuca: Eastern lanes.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...: Eastern lanes. 167.1314 Section 167.1314 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Eastern lanes. In the eastern lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for westbound traffic between the separation zone and a line connecting...

  16. 33 CFR 167.1311 - In the Strait of Juan de Fuca: Western lanes.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...: Western lanes. 167.1311 Section 167.1311 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Western lanes. In the western lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for north-westbound traffic. (1) The traffic lane is established between...

  17. 33 CFR 167.1314 - In the Strait of Juan de Fuca: Eastern lanes.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...: Eastern lanes. 167.1314 Section 167.1314 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Eastern lanes. In the eastern lanes of the Strait of Juan de Fuca, the following are established...′ W (b) A traffic lane for westbound traffic between the separation zone and a line connecting...

  18. 33 CFR 167.1312 - In the Strait of Juan de Fuca: Southern lanes.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...: Southern lanes. 167.1312 Section 167.1312 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Southern lanes. In the southern lanes of the Strait of Juan de Fuca, the following are...′ W 48°10.99′ N 123°24.84′ W (b) A traffic lane for northbound traffic between the separation zone...

  19. 33 CFR 167.1313 - In the Strait of Juan de Fuca: Northern lanes.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...: Northern lanes. 167.1313 Section 167.1313 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Northern lanes. In the northern lanes of the Strait of Juan de Fuca, the following are...′ W (b) A traffic lane for southbound traffic between the separation zone and a line connecting...

  20. 33 CFR 167.1312 - In the Strait of Juan de Fuca: Southern lanes.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...: Southern lanes. 167.1312 Section 167.1312 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... Fuca: Southern lanes. In the southern lanes of the Strait of Juan de Fuca, the following are...′ W 48°10.99′ N 123°24.84′ W (b) A traffic lane for northbound traffic between the separation zone...

  1. Seismic refraction studies in the San Juan Basin, Northwest New Mexico

    USGS Publications Warehouse

    Evans, D.H.; Jaksha, L.H.

    1984-01-01

    The U.S. Geological Survey is studying some of the features of the earth's crust in the San Juan Basin region, northwest New Mexico. As a part of this study seismic refraction-reflection measurements were made in and around the basin using explosions and earthquakes as energy sources. Record sections and traveltime tables were derived from the measurements.

  2. Geochemical and Isotopic Estimates of Eolian Dust in Soils of the San Juan Mountains, USA.

    NASA Astrophysics Data System (ADS)

    Lawrence, C. R.; Neff, J. C.; Farmer, L.; Painter, T. H.; Landry, C.

    2007-12-01

    Eolian dust deposition in the San Juan Mountain Range in southern Colorado has increased 5-7 fold in the past two centuries. This dust deposition contributes an exogenous supply of biologically relevant elements such as Ca, K, Mg, and P to these alpine ecosystems in the form of fine textured mineral particulates. The deposition of eolian dust may be an underestimated factor of soil formation and soil chemistry in these alpine settings. The importance of eolian dust relative to the weathering of local bedrock likely varies across bedrock types. The San Juan Range is geologically diverse with distinct regions of Meso-proterozic crystalline granites in the Weminuche Wilderness, Mesozoic sedimentary layers near Molas Pass in the San Juan National Forest, and Tertiary volcanic geology found on Red Mountain Pass in the Uncompahgre National Forest. Principle component analysis of element chemistry shows that bedrock and soils from these sites cluster by geology. In addition, these groups are chemically distinct from eolian dust collected from snow in the San Juan Range. Several elements seem to drive the difference of dust from soils and bedrock including Ca, Sr, Cu and Cd. The purpose of this research was to estimate the relative contribution of eolian dust to alpine soil element pools in the San Juan Mountains across a range of local geologic parent material. A calculation of element mass- balance shows that Cu and Cd are enriched in the surface soils of both volcanic and sedimentary soils relative to concentrations in local bedrock. However, Ca is enriched only in volcanic soils. These observations support the notion that eolian dust contributes to soil formation and that the relative contribution of dust across the landscape varies with geology. In addition to element mass-balance estimates we utilize Sr and Nd isotope measurements of soil, bedrock, and dust to further constrain the importance of eolian dust to these alpine soils.

  3. Training for Instructional Uses of Multi Media at San Juan College: Toward the Campus of the Future.

    ERIC Educational Resources Information Center

    Griffiths, John; Degner, Ann

    1995-01-01

    Discusses the multimedia computer-assisted instruction (CAI) teacher training project at San Juan College. Highlights include the Instructional Computing Resource Center, equipment, training objectives, instructional design principles, research in CAI, and the implications of learner-controlled instruction. (AEF)

  4. ["Is it an animal inside? "Melanie Klein's unpublished Don Juan Paper (1939)].

    PubMed

    Frank, Claudia

    2008-01-01

    Klein had been asked to contribute an article to the birthday number of the International Journal for Jones. The author outlines how she hurriedly wrote a text about Don Juan which, however, was rejected by the editor. Essential parts of it are presented in German translation. The manuscript is discussed in the context of Klein's published work as well as of the relevant contemporary literature. In Klein's view, Don Juan's genitality is determined by oral impulses and fears. By his manic acting out he attempts to ward off a depressive break-down. The paper ends with some reflections about why Klein--ontrary to her intention--failed to revise her manuscript for later publication. PMID:19230330

  5. Further paleomagnetic results for the San Juan volcanic field of southern Colorado

    USGS Publications Warehouse

    Beck, M.E., Jr.; Sheriff, S.D.; Diehl, J.F.; Hailwood, E.A.; Lipman, P.W.

    1977-01-01

    Combining paleomagnetic data for 17 new sites from the northwest portion of the (Oligocene) San Juan volcanic field of southern Colorado with data for 29 sites previously published yields a paleomagnetic pole at 85??N, 114??E (with a 95% confidence circle of 7.5?? radius). A further combination of the San Juan data with the results of other studies on rocks of Oligocene age from tectonically stable parts of North America gives a mid-Tertiary reference pole located at 81??N, 132.5??E, with a confidence circle of approximately 4??. Mid-Tertiary paleomagnetic poles for the western edge of the continent diverge markedly from this reference pole. ?? 1977.

  6. SPM4: The Yale/San-Juan Southern Proper Motion survey: 100 million absolute proper motions

    NASA Astrophysics Data System (ADS)

    van Altena, W. F.; Girard, T. M.; Casetti, D. I.; Vieira, K.; López, C. E.; Castillo, D.; Monet, D.; Zacharias, N.; Korchagin, V. I.; Platais, I.; Lee, Y. S.; Beers, T. C.; Herrera, D.

    The Yale/San Juan Southern Proper Motion SPM4 Catalog is the culmi- nation of a highly successful 47-year collaboration between the National University of San Juan (UNSJ) and the Yale Southern Observatory (YSO). The SPM4 Catalog contains absolute proper motions, celestial coordinates, blue and visual passband photometry for 103,319,647 stars and galaxies be- tween the south celestial pole and -20 degrees declination. The Catalog is roughly complete to V=17.5 and the precision of its positions and absolute proper motions is approximately 30 to 150 mas and 2 to 10 mas/yr, respec- tively. It is based on photographic and CCD observations taken with the Yale Southern Observatory's double-astrograph at the Cesco Observatory in El Leoncito, Argentina.

  7. Ground water in the San Juan Basin, New Mexico and Colorado

    USGS Publications Warehouse

    Lyford, Forest P.

    1979-01-01

    Principal aquifers in the San Juan Basin of New Mexico and Colorado are the Entrada Sandstone, Westwater Canyon Member of the Morrison Formation, Gallup Sandstone of the Mesaverde Group, several sandstones in the Mesaverde Group above the Gallup (Dalton Sandstone Member of the Crevasse Canyon Formation, Point Lookout Sandstone, Menefee Formation, Cliff House Sandstone), and sandstones of Tertiary age. Most ground water flows from topographically high outcrop areas toward the San Juan River and Rio Grande valley. Much of the water may move through confining layers to other aquifers or to the land surface rather than discharging directly to the streams. Transmissivities of the sandstones range from 50 to 300 square feet per day. Lowest dissolved-solids concentrations occur in or near outcrops of the sandstones and increase in the direction of groundwater flow. Concentrations range from less than 500 milligrams per liter to more than 30,000 milligrams per liter. (Kosco-USGS)

  8. Contribución de la Estación San Juan SLR al Sistema Galileo

    NASA Astrophysics Data System (ADS)

    Podestá, R.; Actis, E.; Alonso, E.; Pacheco, A.; González, A.; Han, Yanben; Wang, Tanqiang; Zhao, Limin; Liu, Chengzhi; Alacoria, J.; Peñaloza, L.; Brizuela, D.; Flores, M.

    The new San Juan Satellite Laser Ranging Station integrates, with number 7406, the International Laser Ranging Service (ILRS) network, being one of the few stations located in the southern hemisphere. It works shooting powerful laser pulses towards satellites at different heights, measuring the time of flight and calculating distances. With this technology we can perform high precision astronomical, geophysical and geodesic studies. Within the full constellation of satellites observed with ILRS, we track the two European pioneer satellites (Giove-A and B) of the future Global Positioning System Galileo, the European competitive response to the currently well established American GPS, of worldwide use. The GPS Galileo will be aimed mostly to civil usage, especially to aerial and terrestrial navigation. The Giove-A satellite was launched out to space on December 28, 2005 from the Baikonur Cosmodrome, on board of the Russian Soyuz rocket. Since mid 2006, 14 Laser Stations -San Juan station included- took part in a follow-up campaign of the Giove-A. Once the satellite orbital behavior was known, a second Giove-B orbiter was launched in April 2008. A constellation of 30 satellites will complete the Galileo system. Since Giove-A orbits the Earth at a height of 23916 kms, only shots from the best SLR world stations can reach it. San Juan station has tracked it, contributing to the study of its motion. As a new station, the San Juan Satellite Laser Ranging Telescope has become one of the best in the world, consequence of a decade of successful Chinese-Argentinean collaboration. FULL TEXT IN SPANISH

  9. Geologic map of the Cochetopa Park and North Pass Calderas, northeastern San Juan Mountains, Colorado

    USGS Publications Warehouse

    Lipman, Peter W.

    2012-01-01

    The San Juan Mountains in southwestern Colorado have long been known as a site of exceptionally voluminous mid-Tertiary volcanism, including at least 22 major ignimbrite sheets (each 150-5,000 km3) and associated caldera structures active at 33-23 Ma. Recent volcanologic and petrologic studies in the San Juan region have focused mainly on several ignimbrite-caldera systems: the southeastern area (Platoro complex), western calderas (Uncompahgre-Silverton-Lake City), and the central cluster (La Garita-Creede calderas). Far less studied has been the northeastern San Juan region, which occupies a transition between earlier volcanism in central Colorado and large-volume younger ignimbrite-caldera foci farther south and west. The present map is based on new field coverage of volcanic rocks in seventeen 7.5' quadrangles in northeastern parts of the volcanic field, high-resolution age determinations for 120 new sites, and petrologic studies involving several hundred new chemical analyses. This mapping and the accompanying lab results (1) document volcanic evolution of the previously unrecognized North Pass caldera and the morphologically beautifully preserved but enigmatic Cochetopa basin, including unique features not previously described from ignimbrite calderas elsewhere; (2) provide evidence for a more rapid recurrence of large ignimbrite eruptions than previously known elsewhere; (3) quantify the regional time-space-volume progression from the earlier Sawatch magmatic trend southward into the San Juan region; and (4) permit more rigorous comparison between the broad mid-Tertiary magmatic belt in the western U.S. Cordillera and the type continental-margin arc volcanism in the central Andes.

  10. No spreading across the southern Juan de Fuca ridge axial cleft during 1994-1996

    USGS Publications Warehouse

    Chadwell, C.D.; Hildebrand, J.A.; Spiess, Fred N.; Morton, J.L.; Normark, W.R.; Reiss, C.A.

    1999-01-01

    Direct-path acoustic measurements between seafloor transponders observed no significant extension (-10 ?? 14 mm/yr) from August 1994 to September 1996 at the southern Juan de Fuca Ridge (44??40' N and 130??20' W). The acoustic path for the measurement is a 691-m baseline straddling the axial cleft, which bounds the Pacific and Juan de Fuca plates. Given an expected full-spreading rate of 56 mm/yr, these data suggest that extension across this plate boundary occurs episodically within the narrow (~1 km) region of the axial valley floor, and that active deformation is occurring between the axial cleft and the plate interior. A cleft-parallel 714-m baseline located 300 m to the west of the cleft on the Pacific plate monitored system performance and, as expected, observed no motion (+5??7 mm/yr) between the 1994 and 1996 surveys.Direct-path acoustic measurements between seafloor transponders observed no significant extension (-10 ?? 14 mm/yr) from August 1994 to September 1996 at the southern Juan de Fuca Ridge (44??40 minutes N and 130??20 minutes W). The acoustic path for the measurement is a 691-m baseline straddling the axial cleft, which bounds the Pacific and Juan de Fuca plates. Given an expected full-spreading rate of 56 mm/yr, these data suggest that extension across this plate boundary occurs episodically within the narrow (approx. 1 km) region of the axial valley floor, and that active deformation is occurring between the axial cleft and the plate interior. A cleft-parallel 714-m baseline located 300 m to the west of the cleft on the Pacific plate monitored system performance and, as expected, observed no motion (+5 ?? 7 mm/yr) between the 1994 and 1996 surveys.

  11. Temporal Geochemistry Data from Five Springs in the Cement Creek Watershed, San Juan County, Colorado

    USGS Publications Warehouse

    Johnson, Raymond H.; Wirt, Laurie; Leib, Kenneth J.

    2008-01-01

    Temporal data from five springs in the Cement Creek watershed, San Juan County, Colorado provide seasonal geochemical data for further research in the formation of ferricretes. In addition, these data can be used to help understand the ground-water flow system. The resulting data demonstrate the difficulty in gathering reliable seasonal data from springs, show the unique geochemistry of each spring due to local geology, and provide seasonal trends in geochemistry for Tiger Iron Spring.

  12. Transform push, oblique subduction resistance, and intraplate stress of the Juan de Fuca Plate

    NASA Astrophysics Data System (ADS)

    Wang, Kelin; He, Jiangheng; Davis, Earl E.

    1997-01-01

    The Juan de Fuca plate is a small oceanic plate between the Pacific and North America plates. In the southernmost region, referred to as the Gorda deformation zone, the maximum compressive stress σ1 constrained by earthquake focal mechanisms is N-S. Off Oregon, and possibly off Washington, NW trending left-lateral faults cutting the Juan de Fuca plate indicate a σ1 in a NE-SW to E-W direction. The magnitude of differential stress increases from north to south; this is inferred from the plastic yielding and distribution of earthquakes throughout the Gorda deformation zone. To understand how tectonic forces determine the stress field of the Juan de Fuca plate, we have modeled the intraplate stress using both elastic and elastic-perfectly plastic plane-stress finite element models. We conclude that the right-lateral shear motion of the Pacific and North America plates is primarily responsible for the stress pattern of the Juan de Fuca plate. The most important roles are played by a compressional force normal to the Mendocino transform fault, a result of the northward push by the Pacific plate and a horizontal resistance operating against the northward, or margin-parallel, component of oblique subduction. Margin-parallel subduction resistance results in large N-S compression in the Gorda deformation zone because the force is integrated over the full length of the Cascadia subduction zone. The Mendocino transform fault serves as a strong buttress that is very weak in shear but capable of transmitting large strike-normal compressive stresses. Internal failure of the Gorda deformation zone potentially places limits on the magnitude of the fault-normal stresses being transmitted and correspondingly on the magnitude of strike-parallel subduction resistance. Transform faults and oblique subduction zones in other parts of the world can be expected to transmit and create stresses in the same manner.

  13. Impacts of Urbanization in the Coastal Tropical City of San Juan, Puerto Rico

    NASA Technical Reports Server (NTRS)

    Comarazamy, Daniel E.; Gonzalez, Jorge E.; Luvall, Jeffrey C.; Rickman, Douglass

    2007-01-01

    Urban sprawl in tropical locations is rapidly accelerating and it is more evident in islands where a large percentage of the population resides along the coasts. This paper focuses on the analysis of the impacts of land use and land cover for urbanization in the tropical coastal city of San Juan, in the Caribbean island of Puerto Rico. A mesoscale numerical model, the Regional Atmospheric Modeling System (RAMS), is used to study the impacts of land use for urbanization in the environment including specific characteristics of the urban heat island in the San Juan Metropolitan Area (SJMA), one of the most noticeable urban cores of the Caribbean. The research also makes use of the observations obtained during the airborne San Juan Atlas Mission. Surface and raw insonde data from the mission are used to validate the atmospheric model yielding satisfactory results. Airborne high resolution remote sensing data are used to update the model's surface characteristics in order to obtain a more accurate and detailed configuration of the SJMA and perform a climate impact analysis based on land cover/land use (LCLU) changes. The impact analysis showed that the presence of the urban landscape of San Juan has an impact reflected in higher air temperatures over the area occupied by the city, with positive values of up to 2.5 degrees C, for the simulations that have specified urban LCLU indexes in the model's bottom boundary. One interesting result of the impact analysis was the finding of a precipitation disturbance shown as a difference in total accumulated rainfall between the present urban landscape and with a potential natural vegetation, apparently induced by the presence of the urban area. Results indicate that the urban-enhanced cloud formation and precipitation development occur mainly downwind of the city, including the accumulated precipitation. This spatial pattern can be explained by the presence of a larger urbanized area in the southwest sector of the city, and of

  14. Juan Ruiz De Alarcón: Impairment as Empowerment in Early Modern Spain

    ERIC Educational Resources Information Center

    Clark, Gloria Bodtorf

    2016-01-01

    Juan Ruiz de Alarcón, a seventeenth-century writer and native of New Spain, so excelled at the craft of writing "comedias" that he is recognized as one of the great writers of early modern Spain. In his personal life Ruiz de Alarcón struggled with a significant bodily impairment, a large hump on both his back and front, which made him…

  15. Transform push, oblique subduction resistance, and intraplate stress of the Juan de Fuca plate

    USGS Publications Warehouse

    Wang, K.; He, J.; Davis, E.E.

    1997-01-01

    The Juan de Fuca plate is a small oceanic plate between the Pacific and North America plates. In the southernmost region, referred to as the Gorda deformation zone, the maximum compressive stress a, constrained by earthquake focal mechanisms is N-S. Off Oregon, and possibly off Washington, NW trending left-lateral faults cutting the Juan de Fuca plate indicate a a, in a NE-SW to E-W direction. The magnitude of differential stress increases from north to south; this is inferred from the plastic yielding and distribution of earthquakes throughout the Gorda deformation zone. To understand how tectonic forces determine the stress field of the Juan de Fuca plate, we have modeled the intraplate stress using both elastic and elastic-perfectly plastic plane-stress finite element models. We conclude that the right-lateral shear motion of the Pacific and North America plates is primarily responsible for the stress pattern of the Juan de Fuca plate. The most important roles are played by a compressional force normal to the Mendocino transform fault, a result of the northward push by the Pacific plate and a horizontal resistance operating against the northward, or margin-parallel, component of oblique subduction. Margin-parallel subduction resistance results in large N-S compression in the Gorda deformation zone because the force is integrated over the full length of the Cascadia subduction zone. The Mendocino transform fault serves as a strong buttress that is very weak in shear but capable of transmitting large strike-normal compressive stresses. Internal failure of the Gorda deformation zone potentially places limits on the magnitude of the fault-normal stresses being transmitted and correspondingly on the magnitude of strike-parallel subduction resistance. Transform faults and oblique subduction zones in other parts of the world can be expected to transmit and create stresses in the same manner. Copyright 1997 by the American Geophysical Union.

  16. The paradigm of paraglacial megafans of the San Juan river basin, Central Andes, Argentina

    NASA Astrophysics Data System (ADS)

    Suvires, Graciela M.

    2014-11-01

    The spatial distribution and several morphometric characteristics of the Quaternary alluvial fans of the San Juan River, in the province of San Juan, at the Central and Western part of Argentina, have been studied to classify them as paraglacial megafans, as well to ratify its depositional environmental conditions. The high sedimentary load exported by San Juan river from the Central Andes to the foreland depressions is estimated about 3,682,200 hm3. The large alluvial fans of Ullum-Zonda and Tulum valleys were deposited into deep tectonic depressions, during the Upper Pleistocene deglaciation stages. The outcome of collecting remotely sensed data, map and DEM data, geophysical data and much fieldwork gave access to morphometric, morphographic and morphogenetic data of these alluvial fans. The main drainage network was mapped on processed images using QGis (vers.2.0.1). Several fan morphometric parameters were measured, such as the size, the shape, the thickness, the surface areas and the sedimentary volume of exported load. The analyzed fans were accumulated in deep tectonic depressions, where the alluvium fill reaches 700 to 1200 m thick. Such fans do not reach the large size that other world megafans have, and this is due to tectonic obstacles, although the sedimentary fill average volume surpasses 514,000 hm3. The author proposes to consider Ullum-Zonda and Tulum alluvial fans as paraglacial megafans. According to the stratigraphic relationships of the tropical South American Rivers, the author considers that the San Juan paraglacial megafans would have occurred in the period before 24 ka BP , possibly corresponding to Middle Pleniglacial (ca 65-24ka BP). They record colder and more humid conditions compared with the present arid and dry conditions.

  17. Juan de Fuca slab geometry and its relation to Wadati-Benioff zone seismicity

    USGS Publications Warehouse

    McCrory, Patricia A.; Blair, J. Luke; Waldhause, Felix; Oppenheimer, David H.

    2012-01-01

    A new model of the subducted Juan de Fuca plate beneath western North America allows first-order correlations between the occurrence of Wadati-Benioff zone earthquakes and slab geometry, temperature, and hydration state. The geo-referenced 3D model, constructed from weighted control points, integrates depth information from earthquake locations and regional seismic velocity studies. We use the model to separate earthquakes that occur in the Cascadia forearc from those that occur within the underlying Juan de Fuca plate and thereby reveal previously obscured details regarding the spatial distribution of earthquakes. Seismicity within the slab is most prevalent where the slab is warped beneath northwestern California and western Washington suggesting that slab flexure, in addition to expected metamorphic dehydration processes, promotes earthquake occurrence within the subducted oceanic plate. Earthquake patterns beneath western Vancouver Island are consistent with slab dehydration processes. Conversely, the lack of slab earthquakes beneath western Oregon is consistent with an anhydrous slab. Double-differenced relocated seismicity resolves a double seismic zone within the slab beneath northwestern California that strongly constrains the location of the plate interface and delineates a cluster of seismicity 10 km above the surface that includes the 1992 M7.1 Mendocino earthquake. We infer that this earthquake ruptured a surface within the Cascadia accretionary margin above the Juan de Fuca plate. We further speculate that this earthquake is associated with a detached fragment of former Farallon plate. Other subsurface tectonic elements within the forearc may have the potential to generate similar damaging earthquakes.

  18. Assessing climate variability effects on dengue incidence in San Juan, Puerto Rico.

    PubMed

    Méndez-Lázaro, Pablo; Muller-Karger, Frank E; Otis, Daniel; McCarthy, Matthew J; Peña-Orellana, Marisol

    2014-09-01

    We test the hypothesis that climate and environmental conditions are becoming favorable for dengue transmission in San Juan, Puerto Rico. Sea Level Pressure (SLP), Mean Sea Level (MSL), Wind, Sea Surface Temperature (SST), Air Surface Temperature (AST), Rainfall, and confirmed dengue cases were analyzed. We evaluated the dengue incidence and environmental data with Principal Component Analysis, Pearson correlation coefficient, Mann-Kendall trend test and logistic regressions. Results indicated that dry days are increasing and wet days are decreasing. MSL is increasing, posing higher risk of dengue as the perimeter of the San Juan Bay estuary expands and shorelines move inland. Warming is evident with both SST and AST. Maximum and minimum air surface temperature extremes have increased. Between 1992 and 2011, dengue transmission increased by a factor of 3.4 (95% CI: 1.9-6.1) for each 1 °C increase in SST. For the period 2007-2011 alone, dengue incidence reached a factor of 5.2 (95% CI: 1.9-13.9) for each 1 °C increase in SST. Teenagers are consistently the age group that suffers the most infections in San Juan. Results help understand possible impacts of different climate change scenarios in planning for social adaptation and public health interventions. PMID:25216253

  19. Geologic Map of the Central San Juan Caldera Cluster, Southwestern Colorado

    USGS Publications Warehouse

    Lipman, Peter W.

    2006-01-01

    The San Juan Mountains are the largest erosional remnant of a composite volcanic field that covered much of the southern Rocky Mountains in middle Tertiary time. The San Juan field consists mainly of intermediate-composition lavas and breccias, erupted about 35-30 Ma from scattered central volcanoes (Conejos Formation) and overlain by voluminous ash-flow sheets erupted from caldera sources. In the central San Juan Mountains, eruption of at least 8,800 km3 of dacitic-rhyolitic magma as nine major ash flow sheets (individually 150-5,000 km3) was accompanied by recurrent caldera subsidence between 28.3 Ma and about 26.5 Ma. Voluminous andesitic-dacitic lavas and breccias erupted from central volcanoes prior to the ash-flow eruptions, and similar lava eruptions continued within and adjacent to the calderas during the period of more silicic explosive volcanism. Exposed calderas vary in size from 10 to 75 km in maximum dimension; the largest calderas are associated with the most voluminous eruptions.

  20. Juan de Fuca slab geometry and its relation to Wadati-Benioff zone seismicity

    NASA Astrophysics Data System (ADS)

    McCrory, Patricia A.; Blair, J. Luke; Waldhauser, Felix; Oppenheimer, David H.

    2012-09-01

    A new model of the subducted Juan de Fuca plate beneath western North America allows first-order correlations between the occurrence of Wadati-Benioff zone earthquakes and slab geometry, temperature, and hydration state. The geo-referenced 3D model, constructed from weighted control points, integrates depth information from earthquake locations and regional seismic velocity studies. We use the model to separate earthquakes that occur in the Cascadia forearc from those that occur within the underlying Juan de Fuca plate and thereby reveal previously obscured details regarding the spatial distribution of earthquakes. Seismicity within the slab is most prevalent where the slab is warped beneath northwestern California and western Washington suggesting that slab flexure, in addition to expected metamorphic dehydration processes, promotes earthquake occurrence within the subducted oceanic plate. Earthquake patterns beneath western Vancouver Island are consistent with slab dehydration processes. Conversely, the lack of slab earthquakes beneath western Oregon is consistent with an anhydrous slab. Double-differenced relocated seismicity resolves a double seismic zone within the slab beneath northwestern California that strongly constrains the location of the plate interface and delineates a cluster of seismicity 10 km above the surface that includes the 1992 M7.1 Mendocino earthquake. We infer that this earthquake ruptured a surface within the Cascadia accretionary margin above the Juan de Fuca plate. We further speculate that this earthquake is associated with a detached fragment of former Farallon plate. Other subsurface tectonic elements within the forearc may have the potential to generate similar damaging earthquakes.

  1. San Juan Satellite Laser Ranging. Performance and Precission in the Observations

    NASA Astrophysics Data System (ADS)

    Podestá, R.; Actis, E.; Alonso, E.; Pacheco, A.; González, A.; Gómez, W.; Yan-Ben, H.; Tanqiang, W.; Weidong, L.; Qingge, X.; Dongpin, H.

    2009-05-01

    In this paper we present the San Juan Fixed Station SLR N 7406 in Argentina, installed according to an international agreement between the Astronomical Observatory Félix Aguilar (OAFA, belonging to the National University of San Juan) and the National Astronomical Observatory of China (NAOC, belonging to the Chinese Academy of Sciences), which has been working continually since 2006. We give the perfomance reached by this new telescope in precission and number of observations, regarding the standard satellite LAGEOS, and we carry out a comparison with the values given by the International Laser Ranging System (ILRS) with other instruments of the SLR world net. The results of the LAGEOS observations show that our determinations of the pass average normal points rms are in the order of 12 millimeters and the pass number full rate are very abundant. The San Juan Station is now the strongest station in South America and is becoming more crucial to both the evolution of the Terrestrial Reference Frame and the SLR precission orbit determination of the world.

  2. Contemporary geochemical composition and flux of aeolian dust to the San Juan Mountains, Colorado, United States

    NASA Astrophysics Data System (ADS)

    Lawrence, Corey R.; Painter, T. H.; Landry, C. C.; Neff, J. C.

    2010-09-01

    Dust deposition in the Rocky Mountains may be an important biogeochemical flux from upwind ecosystems. Seasonal (winter/spring) dust mass fluxes to the San Juan Mountains during the period from 2004 to 2008 ranged from 5 to 10 g m-2, with individual deposition events reaching as high as 2 g m-2. Dust deposited in the San Juan Mountains was primarily composed of silt- and clay-sized particles, indicating a regional source area. The concentrations of most major and minor elements in this dust were similar to or less than average upper continental crustal concentrations, whereas trace element concentrations were often enriched. In particular, dust collected from the San Juan Mountain snowpack was characterized by enrichments of heavy metals including As, Cu, Cd, Mo, Pb, and Zn. The mineral composition of dust partially explained dust geochemistry; however, based on results of a sequential leaching procedure it appeared that trace element enrichments were associated with the organic-, and not the mineral-, fraction of dust. Our observations show that the dust-derived fluxes of several nutrients and trace metals are substantial and, because many elements are deposited in a mobile form, could be important controls of vegetation, soil, or surface water chemistry. The flux measurements reported here are useful benchmarks for the characterization of ecosystem biogeochemical cycling in the Rocky Mountains.

  3. The accretion of aeolian dust in soils of the San Juan Mountains, Colorado, USA

    NASA Astrophysics Data System (ADS)

    Lawrence, Corey R.; Neff, Jason C.; Farmer, G. Lang

    2011-06-01

    Recent observations suggest a contemporary aeolian dust flux of at least 5-10 g m-2 yr-1 to high-elevation ecosystems of the San Juan Mountains of southwestern Colorado. To better quantify the influence of dust on San Juan soil geochemistry, we used Sr and Nd isotopic mixing models to estimate the total mass of accreted dust in soils of two alpine basins underlain by bedrocks of different geochemical composition. In order to minimize the potentially confounding effects caused by transient soil pools of Sr and Nd, we implemented a sequential leaching procedure that isolates the residual mineral fraction of soils and their putative parent materials, including local saprolite and exogenous dust inputs. Using this approach, we calculated masses of accreted dust in soils, which were similar across the two isotopic tracers and differing local geologies. Long-term rates of dust accretion were estimated to be slightly higher than contemporary rates of dust deposition. We conclude that dust inputs comprise from 10% to 40% of the total soil mass in these ecosystems. Our observations suggest that dust inputs have exerted a primary control on soil development in the San Juan Mountains and have likely influenced the physical and chemical characteristics of soils in this region.

  4. The densest meteorite collection area in hot deserts: The San Juan meteorite field (Atacama Desert, Chile)

    NASA Astrophysics Data System (ADS)

    Gattacceca, Jérôme; Valenzuela, Millarca; Uehara, Minoru; Jull, A. J. Timothy; Giscard, Marlène; Rochette, Pierre; Braucher, Régis; Suavet, Clement; Gounelle, Matthieu; Morata, Diego; Munayco, Pablo; Bourot-Denise, Michèle; Bourles, Didier; Demory, François

    2011-09-01

    Abstract- We describe the geological, morphological, and climatic setting of the San Juan meteorite collection area in the Central Depression of the Atacama Desert (Chile). Our recovery activities yielded 48 meteorites corresponding to a minimum of 36 different falls within a 3.88 km2 area. The recovery density is in the range 9-12 falls km-2 depending on pairing, making it the densest among meteorite collection areas in hot deserts. This high meteorite concentration is linked to the long-standing hyperaridity of the area, the stability of the surface pebbles (> Ma), and very low erosion rates of surface pebbles (approximately 30 cm Ma-1 maximum). The San Juan meteorite population is characterized by old terrestrial ages that range from zero to beyond 40 ka, and limited weathering compared with other dense collection areas in hot desert. Chemical weathering in San Juan is slow and mainly controlled by the initial porosity of meteorites. As in the Antarctic and other hot deserts, there is an overabundance of H chondrites and a shortage of LL chondrites compared with the modern falls population, suggesting a recent (< few ka) change in the composition of the meteorite flux to Earth.

  5. Carbon Isotopic tests on the Origins of the Shuram Anomaly from the San Juan Fm., Peru

    NASA Astrophysics Data System (ADS)

    Hodgin, E. B.

    2015-12-01

    Carbon isotope anomalies are associated with perturbations to the carbon cycle that offer insight into the geochemical evolution of the Earth. The largest Carbon isotope anomaly in earth history is the Shuram, which remains poorly understood in spite of being linked to the oxygenation of earth, the rise of metazoans, and a complete reorganization of the carbon cycle. From a basin transect of the carbonate-dominated San Juan Formation in southern Peru, we present evidence for the first clear example of the Shuram isotope anomaly in South America. Unique to this succession are ~140 meters of organic-rich black shale within the anomaly, containing as much as 4% TOC. Preliminary data from the organic-rich black shales of the San Juan Fm. confirm that δ13Corg is relatively invariant and does not covary with δ13Ccarb. These observations are consistent with other Shuram sections and support various models: an exogenous carbon source, an enlarged dissolved organic carbon pool, as well as authigenic carbonate production in organic-rich anoxic sediments. Critical tests of these models have been complicated by a paucity of organics in Shuram facies worldwide. Further analyses of the robust organics from the Shuram facies of the San Juan Fm. therefore hold promise in shedding light on the origin of the Shuram isotope anomaly and critical earth history events to which it has been linked.

  6. Mantle flow geometry from ridge to trench beneath the Gorda-Juan de Fuca plate system

    NASA Astrophysics Data System (ADS)

    Martin-Short, Robert; Allen, Richard M.; Bastow, Ian D.; Totten, Eoghan; Richards, Mark A.

    2015-12-01

    Tectonic plates are underlain by a low-viscosity mantle layer, the asthenosphere. Asthenospheric flow may be induced by the overriding plate or by deeper mantle convection. Shear strain due to this flow can be inferred using the directional dependence of seismic wave speeds--seismic anisotropy. However, isolation of asthenospheric signals is challenging; most seismometers are located on continents, whose complex structure influences the seismic waves en route to the surface. The Cascadia Initiative, an offshore seismometer deployment in the US Pacific Northwest, offers the opportunity to analyse seismic data recorded on simpler oceanic lithosphere. Here we use measurements of seismic anisotropy across the Juan de Fuca and Gorda plates to reconstruct patterns of asthenospheric mantle shear flow from the Juan de Fuca mid-ocean ridge to the Cascadia subduction zone trench. We find that the direction of fastest seismic wave motion rotates with increasing distance from the mid-ocean ridge to become aligned with the direction of motion of the Juan de Fuca Plate, implying that this plate influences mantle flow. In contrast, asthenospheric mantle flow beneath the Gorda Plate does not align with Gorda Plate motion and instead aligns with the neighbouring Pacific Plate motion. These results show that asthenospheric flow beneath the small, slow-moving Gorda Plate is controlled largely by advection due to the much larger, faster-moving Pacific Plate.

  7. Fission-track dating of the tectonic development of the San Juan Islands, Washington.

    USGS Publications Warehouse

    Johnson, S.Y.; Zimmerman, R.A.; Naeser, C.W.; Whetten, J.T.

    1986-01-01

    Previous geological studies have indicated that the major thrusting event in the San Juan Islands was of late-early to late Cretaceous age. Geochronological data are consistent with these prior inferences and confirm that thrusting occurred between approx 105 and 75 m.y. Reset zircon fission-track dates indicate the possible presence of a reversed geothermal gradient in the Decatur terrain, the uppermost preserved thrust plate. If present, this gradient was probably produced by conductive heating, and possibly by shear heating associated with a now-eroded overlying thrust plate and thrust fault. Thrusting in the southern San Juan Islands was accompanied by uplift and resetting of apatite dates. The Haro formation, the Spieden group, and their basement (probably the Wrangellia terrain) did not experience this uplift and probably acted as a 'backstop' to thrusting. Uplift of the southern San Juan Islands was, therefore, probably mainly accommodated on the Haro fault. The Nanaimo basin formed in the foreland of this advancing thrust system, probably as a response to thrust-related loading. Eastern exposures of the Nanaimo group were uplifted prior to deposition of the Middle and Upper Eocene Padden member of the Chucknaut formation, perhaps along a reactivated Haro fault system. -J.M.H.

  8. Assessing Climate Variability Effects on Dengue Incidence in San Juan, Puerto Rico

    PubMed Central

    Méndez-Lázaro, Pablo; Muller-Karger, Frank E.; Otis, Daniel; McCarthy, Matthew J.; Peña-Orellana, Marisol

    2014-01-01

    We test the hypothesis that climate and environmental conditions are becoming favorable for dengue transmission in San Juan, Puerto Rico. Sea Level Pressure (SLP), Mean Sea Level (MSL), Wind, Sea Surface Temperature (SST), Air Surface Temperature (AST), Rainfall, and confirmed dengue cases were analyzed. We evaluated the dengue incidence and environmental data with Principal Component Analysis, Pearson correlation coefficient, Mann-Kendall trend test and logistic regressions. Results indicated that dry days are increasing and wet days are decreasing. MSL is increasing, posing higher risk of dengue as the perimeter of the San Juan Bay estuary expands and shorelines move inland. Warming is evident with both SST and AST. Maximum and minimum air surface temperature extremes have increased. Between 1992 and 2011, dengue transmission increased by a factor of 3.4 (95% CI: 1.9–6.1) for each 1 °C increase in SST. For the period 2007–2011 alone, dengue incidence reached a factor of 5.2 (95% CI: 1.9–13.9) for each 1 °C increase in SST. Teenagers are consistently the age group that suffers the most infections in San Juan. Results help understand possible impacts of different climate change scenarios in planning for social adaptation and public health interventions. PMID:25216253

  9. Nuevos fenómenos en erupciones cometarias

    NASA Astrophysics Data System (ADS)

    Silva, A.

    Se discuten aquí tres procesos físicos novedosos encontrados en la actividad de cometas: 1) El rol de una distribución de granos de hielo como fuente extendida de H2O en la coma, 2) El efecto de una discontinuidad en el plasma cometario, llamada Cometopausa, sobre la excitación del radical OH , y 3) La actividad por erupciones a grandes distancias heliocéntricas (r > 5 AU). Con respecto a 1) y 2), se presentan modelos que ajustan bien con las observaciones. En cuanto a 3), se presentan explicaciones posibles al fenómeno, y se trata el interesante caso de Chirón 2060, basándose en observaciones propias tomadas desde el CASLEO y datos anteriores.

  10. Water Management Decisions using Multiple Hydrologic Models Within the San Juan River Basin Under Changing Climate Conditions

    NASA Astrophysics Data System (ADS)

    Piechota, T. C.; Miller, W. P.; Butler, R. A.; Prairie, J. R.; Derosa, G. M.

    2011-12-01

    A modified version of the Bureau of Reclamation (Reclamation) long-term planning model, Colorado River Simulation System (CRSS), is used to evaluate whether hydrologic model choice has an impact on critical decision variables within the San Juan River Basin when evaluating potential impacts of climate change through 2099. The distributed Variable Infiltration Capacity (VIC) model and the lumped National Weather Service (NWS) River Forecast System (RFS) were each used to project future streamflow; these projections of streamflow were then used to force Reclamation's CRSS model over the San Juan River Basin. Both hydrologic models were compared to evaluate whether or not uncertainty in climatic input generated from General Circulation Models outweighed differences between the hydrologic models. Differences in methodologies employed by each hydrologic model had a significant impact on projected streamflow within the basin. Both models project decreased water availability under changing climate conditions within the San Juan River Basin, but disagree on the magnitude of the decrease. On average, total naturalized inflow within the San Juan River Basin into the Navajo Reservoir is approximately 15% higher using inflows derived using the VIC model than those inflows developed using the RFS model; average projected tributary inflow from the San Juan River Basin to the Colorado River is approximately 25% higher using inflows derived using the VIC model than those inflows developed using the RFS. Overall, there is a higher risk and magnitude of shortage within the San Juan River Basin using streamflow developed using the RFS model as compared to inflow scenarios developed using the VIC model. Model choice was found to have a significant impact on the evaluation of climate change impacts over the San Juan River Basin.

  11. Divergent Ridge Features on the Juan de Fuca and Gorda Ridges

    NASA Astrophysics Data System (ADS)

    Eaton, M. E.; Sautter, L.; Steele, M.

    2014-12-01

    Multibeam data collected using a Kongsberg EM122 sonar system on the NOAA ship R/V Marcus G. Langseth led by chief scientist Douglas Toomey (University of Oregon) in 2009 and with a Simrad EM302 sonar system on two NOAA ship Okeanos Explorer cruises led by chief scientists James Gardner (University of New Hampshire) and Catalina Martinez (University of Rhode Island) in 2009 show the morphology of the Juan de Fuca and Gorda Ridges, as well as the Blanco and Mendocino Fracture Zones. These ridges and fracture zones comprise the divergent plate boundary of the eastern edge of the Pacific Plate and the western edges of the Juan de Fuca and Gorda Plates. Both plates are being subducted beneath the western edge of the North American Plate. CARIS HIPS 8.1 software was used to process the multibeam data and create bathymetric images. The ridge axes, located off the coast of Washington and Oregon (USA) adjacent to the Cascadia Basin, indicate obvious signs of spreading, due to the series of faults and rocky ridges aligned parallel to the plate boundaries. Fault and ridge orientations are used to compare the direction of seafloor spreading, and indicate that both the Juan de Fuca Plate and Gorda Plate are spreading in a southeastern direction. Younger ridges from the Gorda Ridge system mapped in the study run parallel to the boundary, however older ridges do not show the same orientation, indicating a change in spreading direction. The presence of hydrothermal vents along the Juan de Fuca Ridge is also evidence of the active boundary, as the vent chimneys are composed of minerals and metals precipitated from the hot water heated by magma from beneath the spreading seafloor. In this study, the data are used to compare and contrast earthquake seismicity and ridge morphologies at a depth range of approximately 762 to 2134 meters. The diverging Pacific, Juan de Fuca, and Gorda Plates along with the San Andreas Fault have potential to increase seismic and volcanic activity around

  12. Las características más fascinantes del nuevo Robot

    NASA Video Gallery

    impresionante es la palabra que describe perfectamente al nuevo robot Curiosity por su tamaño, sus instrumentos científicos y la manera en que la NASA planifica hacerlo aterrizar en Marte de forma ...

  13. Juan de Fuca Plate Ridge-to-Trench Experiment: initial results from active source seismic imaging of the Juan de Fuca plate and Cascadia fore-arc (Invited)

    NASA Astrophysics Data System (ADS)

    Carbotte, S. M.; Canales, J.; Carton, H. D.; Han, S.; Gibson, J. C.; Janiszewski, H. A.; Horning, G.; Nedimovic, M. R.; Abers, G. A.; Trehu, A. M.

    2013-12-01

    Active source seismic data were acquired during the Juan de Fuca Ridge-to-Trench experiment (June-July 2012) to characterize the evolution and structure of the Juan de Fuca plate from formation at the ridge, through evolution in the plate interior, to subduction at the Cascadia trench. The survey provides plate-scale images of the sediments, crust, and shallowest mantle along two ridge-perpendicular transects, one extending from Axial seamount to the Oregon margin near Hydrate Ridge and the other from near Endeavour segment to Grays Harbor offshore Washington. In addition, a 450 km long trench-parallel line ~10 km seaward of the Cascadia deformation front was acquired to characterize variations in plate structure along the margin. Coincident long-streamer (8 km) multi-channel seismic (MCS) and wide-angle ocean bottom seismometer (OBS) data were collected along each transect. Using these data, our current investigations focus on the properties of the thick sediment blanket covering the Juan de Fuca plate and evidence for fluid flow at the deformation front, crustal structure within the plate interior and near the deformation front, and tracking the downgoing plate beneath the margin. Highlights include the discovery of numerous pockmarks on the seafloor providing evidence of active fluid flow up to 60 km west of the deformation front. Along the Oregon transect, a bright decollement horizon is imaged at ~1sec twtt above basement whereas at the Washington margin, protothrusts of the deformation front reach to the top of the oceanic crust. Variations in sediment properties are documented within the margin-parallel transect with changes in the stratigraphic level of decollement. While crustal thickness is quite uniform along the margin (~ 6 km), variations in crustal reflectivity and in shallowest mantle velocities are observed over ~30-50 km length scales that could be related to structural variations in the Cascadia subduction zone. Further landward, the top of the

  14. Impacts of Hydrologic Model Decision to Water Management Within the San Juan River Basin Under Changing Climate Conditions

    NASA Astrophysics Data System (ADS)

    Piechota, T. C.; Miller, W. P.

    2010-12-01

    A modified version of the U.S. Department of the Interior, Bureau of Reclamation (Reclamation) Colorado River Simulation System (CRSS) is used to evaluate potential impacts of climate change to the San Juan River Basin through 2099. Using temporally disaggregated, bias-corrected spatially downscaled projections of temperature and precipitation, 112 projections of future streamflow for each model were developed using the distributed Variable Infiltration Capacity (VIC) model and the lumped National Weather Service (NWS) River Forecast System (RFS) provided by the Colorado Basin River Forecasting Center. These projections from the VIC model and NWS RFS were then used to force Reclamation’s CRSS model over the San Juan River Basin. On average, inflow into the Navajo Reservoir is approximately 5% higher using inflows derived using the NWS RFS than those inflows developed using the VIC model; however, average inflow over the entire San Juan River Basin is approximately 9% higher using inflows derived using the VIC model than those inflows developed using the NWS RFS. Regulated streamflow to Lake Powell is projected to decrease by up to 39% under changing climate conditions. Overall, there is a higher risk of shortage within the San Juan River Basin using streamflow developed using the NWS RFS model as compared to inflow scenarios developed using the VIC model. Both models project decreased water availability under changing climate conditions within the San Juan River Basin, which may adversely impact water users throughout the Colorado River Basin.

  15. Strengthening the Community/Education Partnership: The San Juan RFD Model of Public Involvement. Public Involvement Using the Rural Futures Development Strategy.

    ERIC Educational Resources Information Center

    Rasmussen, Randy C.; Jensen, Carl

    San Juan School District, a rural school district in the southeast corner of Utah, implemented the Rural Futures Development (RFD) Strategy program to develop greater public involvement in the education process. Geographically one of the largest school districts (approximately 8,000 square miles) in the U.S., San Juan serves Anglos who mainly live…

  16. 33 CFR 334.1200 - Strait of Juan de Fuca, eastern end; off the westerly shore of Whidbey Island; naval restricted...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Register citations affecting § 334.1200, see the List of CFR Sections Affected, which appears in the... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Strait of Juan de Fuca, eastern... AND RESTRICTED AREA REGULATIONS § 334.1200 Strait of Juan de Fuca, eastern end; off the westerly...

  17. Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado

    USGS Publications Warehouse

    Bove, Dana J.; Hon, Ken; Budding, Karin E.; Slack, John F.; Snee, Lawrence W.; Yeoman, Ross A.

    2001-01-01

    This paper presents 25 new 40Ar/39Ar dates from the main calc-alkaline ash-flow sheets and related younger plutons of the western San Juan volcanic field, the ash-flow sheets of the Lake City caldera cycle, and veins and other altered rocks in the Lake City region. The goal of the study was to produce similar quality 40Ar/39Ar ages to those currently published for the eastern and central San Juan Mountains. These new data provide a much more precise chronological framework for interpreting durations of events and their relationship to mineralization than do previously published conventional K-Ar dates for the western San Juan Mountains.

  18. Marine Biodiversity in Juan Fernández and Desventuradas Islands, Chile: Global Endemism Hotspots.

    PubMed

    Friedlander, Alan M; Ballesteros, Enric; Caselle, Jennifer E; Gaymer, Carlos F; Palma, Alvaro T; Petit, Ignacio; Varas, Eduardo; Muñoz Wilson, Alex; Sala, Enric

    2016-01-01

    The Juan Fernández and Desventuradas islands are among the few oceanic islands belonging to Chile. They possess a unique mix of tropical, subtropical, and temperate marine species, and although close to continental South America, elements of the biota have greater affinities with the central and south Pacific owing to the Humboldt Current, which creates a strong biogeographic barrier between these islands and the continent. The Juan Fernández Archipelago has ~700 people, with the major industry being the fishery for the endemic lobster, Jasus frontalis. The Desventuradas Islands are uninhabited except for a small Chilean military garrison on San Félix Island. We compared the marine biodiversity of these islands across multiple taxonomic groups. At San Ambrosio Island (SA), in Desventuradas, the laminarian kelp (Eisenia cokeri), which is limited to Desventuradas in Chile, accounted for >50% of the benthic cover at wave exposed areas, while more sheltered sites were dominated by sea urchin barrens. The benthos at Robinson Crusoe Island (RC), in the Juan Fernández Archipelago, comprised a diverse mix of macroalgae and invertebrates, a number of which are endemic to the region. The biomass of commercially targeted fishes was >2 times higher in remote sites around RC compared to sheltered locations closest to port, and overall biomass was 35% higher around SA compared to RC, likely reflecting fishing effects around RC. The number of endemic fish species was extremely high at both islands, with 87.5% of the species surveyed at RC and 72% at SA consisting of regional endemics. Remarkably, endemics accounted for 99% of the numerical abundance of fishes surveyed at RC and 96% at SA, which is the highest assemblage-level endemism known for any individual marine ecosystem on earth. Our results highlight the uniqueness and global significance of these biodiversity hotspots exposed to very different fishing pressures. PMID:26734732

  19. Dengue Fever Trends and Climate Change in San Juan, Puerto Rico

    NASA Astrophysics Data System (ADS)

    Muller-Karger, F. E.; Mendez-Lazaro, P.; Otis, D. B.; McCarthy, M.; Pena-Orellana, M.

    2014-12-01

    Climate change has important implications for public health. We developed and tested the hypothesis that conditions for dengue fever transmission in San Juan (Puerto Rico, USA) are becoming favorable as a result of meteorological drivers being modified with climate change. Sea level pressure, mean sea level (MSL), wind, sea surface temperature (SST), air surface temperature (AST), rainfall, and confirmed dengue cases were variables examined over the past 30 years, or longer for some variables. Statistical tools used included Principal Component Analysis, Pearson correlation coefficient, Mann-Kendall trend tests, and logistic regressions. Results show that dry days are increasing and that wet days are decreasing. MSL is steadily increasing, which increases the risk of dengue cases along the coast, as the perimeter of the San Juan Bay estuary expands and the shoreline moves inland. Warming is evident in both SST and AST. Maximum and minimum air surface temperature extremes have also increased. Incidence of dengue is accelerating along with environmental change. For example, between 2000-2011, dengue transmission increased by a factor of 3.4 (95% CI: 1.9-6.1) for each 1ºC increase in SST. Between 2007 and 2011, this risk factor increased to 5.2 (95% CI: 1.9-13.9) for every 1ºC increase in SST. An important but difficult to examine problem is how social and economic factors affect such dengue fever transmission rates in light of environmental change. A concern is that the patterns observed in San Juan are representative of potential incidence of dengue virus in other parts of the island of Puerto Rico and in other Caribbean nations. These results help understand patterns of disease spreading, and allow public health officials to evaluate scenarios and interventions intended to mitigate the impacts of climate change.

  20. Marine Biodiversity in Juan Fernández and Desventuradas Islands, Chile: Global Endemism Hotspots

    PubMed Central

    Friedlander, Alan M.; Ballesteros, Enric; Caselle, Jennifer E.; Gaymer, Carlos F.; Palma, Alvaro T.; Petit, Ignacio; Varas, Eduardo; Muñoz Wilson, Alex; Sala, Enric

    2016-01-01

    The Juan Fernández and Desventuradas islands are among the few oceanic islands belonging to Chile. They possess a unique mix of tropical, subtropical, and temperate marine species, and although close to continental South America, elements of the biota have greater affinities with the central and south Pacific owing to the Humboldt Current, which creates a strong biogeographic barrier between these islands and the continent. The Juan Fernández Archipelago has ~700 people, with the major industry being the fishery for the endemic lobster, Jasus frontalis. The Desventuradas Islands are uninhabited except for a small Chilean military garrison on San Félix Island. We compared the marine biodiversity of these islands across multiple taxonomic groups. At San Ambrosio Island (SA), in Desventuradas, the laminarian kelp (Eisenia cokeri), which is limited to Desventuradas in Chile, accounted for >50% of the benthic cover at wave exposed areas, while more sheltered sites were dominated by sea urchin barrens. The benthos at Robinson Crusoe Island (RC), in the Juan Fernández Archipelago, comprised a diverse mix of macroalgae and invertebrates, a number of which are endemic to the region. The biomass of commercially targeted fishes was >2 times higher in remote sites around RC compared to sheltered locations closest to port, and overall biomass was 35% higher around SA compared to RC, likely reflecting fishing effects around RC. The number of endemic fish species was extremely high at both islands, with 87.5% of the species surveyed at RC and 72% at SA consisting of regional endemics. Remarkably, endemics accounted for 99% of the numerical abundance of fishes surveyed at RC and 96% at SA, which is the highest assemblage-level endemism known for any individual marine ecosystem on earth. Our results highlight the uniqueness and global significance of these biodiversity hotspots exposed to very different fishing pressures. PMID:26734732

  1. Effects of Desert Dust on Nutrient Cycling in the San Juan Mountains, Colorado

    NASA Astrophysics Data System (ADS)

    Neff, J. C.; Farmer, L.; Painter, T. H.; Landry, C.; Reynolds, R.

    2005-12-01

    The San Juan Mountains of southwestern Colorado lie downwind from several major deserts and experience several dust-deposition events each year. These events appear related to storms that erode soils in the deserts of the western US and then deposit atmospheric dust from these soils during or after snowfall during large late winter and spring deposition events. To evaluate the biogeochemical implications of eolian deposition, we collected dust from distinct layers deposited into the seasonal snowpack. We also sampled soils and lake sediments in a high-elevation catchment in the San Juan Mountains. Atmospheric dust was characterized by measurements of chemical composition, Sr isotopic content and analysis of the organic and inorganic constituents of deposited eolian material. The origins of snowpack dust in the San Juans were analyzed using atmospheric tracer transport modeling. These analyses suggest that many dust events originate in southern Utah and northern Arizona, areas that have undergone substantial land use change through the 20th century and that experience severe wind erosion of soils during periodic severe droughts. Analyses of 87Sr/86Sr isotope ratios dust, soils, bedrock, and sediments suggest that eolian dust may compose as much as 90% of the near-surface soil (top 5 cm). In alpine lake sediments, Sr isotopes suggest a relatively recent (20th century) increase in the fraction of sediments derived from dust (relative to bedrock) and a similarly large contribution of dust to surface sediments. Sediment chemistry in two small alpine tarns show changes in Ca, Mg, Al, and Fe concentrations that imply increasing dust (vs. bedrock) contributions to lake sediments over the past 100-200 years. Increasing loading of Ca, Mg and P to alpine basins may have implications for alpine and sub-alpine biogeochemical cycling including water quality and plant nutrient use.

  2. [Didn't it matter to him absolutely?: Juan Vilanova and the controversy about tertiary man].

    PubMed

    Catalá Gorgues, Jesús I

    2011-01-01

    During the founding period of palaeoanthropology, the postulate about tertiary age of humankind was an outstanding subject. First proposals were based on supposed proofs about ancient lithical industry (eoliths). Some discoveries of human fossil remains complicated that issue, because they were dated as pliocene or oldest. This controversy about so-called "tertiary man" soon arrived to Spain. Juan Vilanova y Piera, palaeontologist and professor at Madrid, dealt with it from an antievolutionist point of view. When a human fossil skeleton, included in the Botet's collections, with several apparently primitive traits arrived to Valencia from Argentina, Vilanova got reasserted and exposed his ideas about this question more intensely. PMID:22371987

  3. Data for ground-water studies of the San Juan Basin, New Mexico (1982-83)

    USGS Publications Warehouse

    Klausing, R.L.; Welder, G.E.

    1983-01-01

    Ground-water data that can be used for futher hydrologic studies in the San Juan structural basin of New Mexico are reported. Descriptions and a location map of 64 observation wells, a list of water levels measured in the observation wells, water-level hydrographs of 32 wells, 15 partial chemical analyses of water samples from wells, and descriptions and a location map of 264 potential observations wells are included. The latter are wells for which good records exist. Their potential for use as observation wells needs to be verified in the field. (USGS)

  4. Isotopic evidence of Holocene climatic change in the San Juan Mountains, Colorado

    USGS Publications Warehouse

    Friedman, I.; Carrara, P.; Gleason, J.

    1988-01-01

    The ??D of cellulose from 14C-dated wood, collected in the San Juan Mountains of southwestern Colorado, decreased by about 45??? from 9600 to 3100 yr B.P. and an additional 25??? to the present. The wood samples are from trees that grew above present-day tree line and reflect a time of warmer average summer temperatures. These changes in ??D are interpreted to indicate a major change during the Holocene in the sources of moisture, in the seasonality of precipitation, or in both. ?? 1988.

  5. [Study of prevalence of pain at the Juan Canalejo Hospital in La Coruña].

    PubMed

    Valero, J; Palacios, P; Vazquez-Barro, A; Lopez-Suso, E; Carpintero, D

    1995-12-01

    A study of prevalence of pain conducted in 812 patients admitted in the Juan Canalejo Hospital in La Coruña (Spain). This is primarily an adult hospital. Of the 650 patients whose replies were deemed valid, 35.69% were suffering pain. Other findings were that the sociocultural level of the patients affected their assessment of pain and that 46.12% of those who were suffering pain were not receiving analgesics at that time. Magnesium dipyrone, a combination of paracetamol and codeine and morphine were the most commonly used drugs, although there was clearunderuse of analgesic. PMID:8679800

  6. Impacts of Urbanization in the Coastal Tropical City of San Juan, Puerto Rico

    NASA Technical Reports Server (NTRS)

    Comarazamy, Daniel E.; Gonzalez, Jorge E.; Luvall, Jeffrey C.; Rickman, Douglas L.; Mulero, Pedro J.

    2007-01-01

    Urban sprawl in tropical locations is rapidly accelerating and it is more evident in islands where a large percentage of the population resides along the coasts. This paper focuses on the analysis of the impacts of land use and land cover for urbanization in the tropical coastal city of San Juan, in the Caribbean island of Puerto Rico. A mesoscale numerical model, the Regional Atmospheric Modeling System (RAMS), is used to study the impacts of land use for urbanization in the environment including specific characteristics of the urban heat island in the San Juan Metropolitan Area (SJMA), one of the most noticeable urban cores of the Caribbean. The research also makes use of the observations obtained during the airborne San Juan Atlas Mission. Surface and rawinsonde data from the mission are used to validate the atmospheric model yielding satisfactory results. Airborne high resolution remote sensing data are used to update the model's surface characteristics in order to obtain a more accurate and detailed configuration of the SJMA and perform a climate impact analysis based on land cover/land use (LCLU) changes. The impact analysis showed that the presence of the urban landscape of San Juan has an impact reflected in higher air temperatures over the area occupied by the city, with positive values of up to 2.5 C, for the simulations that have specified urban LCLU indexes in the model's bottom boundary. One interesting result of the impact analysis was the finding of a precipitation disturbance shown as a difference in total accumulated rainfall between the present urban landscape and with a potential natural vegetation, apparently induced by the presence of the urban area. Results indicate that the urban enhanced cloud formation and precipitation development occur mainly downwind of the city, including the accumulated precipitation. This spatial pattern can be explained by the presence of a larger urbanized area in the southwest sector of the city, and of the

  7. Geology, thermal maturation, and source rock geochemistry in a volcanic covered basin: San Juan sag, south-central Colorado

    USGS Publications Warehouse

    Gries, R.R.; Clayton, J.L.; Leonard, C.

    1997-01-01

    The San Juan sag, concealed by the vast San Juan volcanic field of south-central Colorado, has only recently benefited from oil and gas wildcat drilling and evaluations. Sound geochemical analyses and maturation modeling are essential elements for successful exploration and development. Oil has been produced in minor quantities from an Oligocene sill in the Mancos Shale within the sag, and major oil and gas production occurs from stratigraphically equivalent rocks in the San Juan basin to the south-west and in the Denver basin to the northeast. The objectives of this study were to identify potential source rocks, assess thermal maturity, and determine hydrocarbon-source bed relationships. Source rocks are present in the San Juan sag in the upper and lower Mancos Shale (including the Niobrara Member), which consists of about 666 m (2184 ft) of marine shale with from 0.5 to 3.1 wt. % organic carbon. Pyrolysis yields (S1 + S2 = 2000-6000 ppm) and solvent extraction yields (1000-4000 ppm) indicate that some intervals within the Mancos Shale are good potential source rocks for oil, containing type II organic matter, according to Rock-Eval pyrolysis assay. Oils produced from the San Juan sag and adjacent part of the San Juan basin are geochemically similar to rock extracts obtained from these potential source rock intervals. Based on reconstruction of the geologic history of the basin integrated with models of organic maturation, we conclude that most of the source rock maturation occurred in the Oligocene and Miocene. Little to no maturation took place during Laramide subsidence of the basin, when the Animas and Blanco Basin formations were deposited. The timing of maturation is unlike that of most Laramide basins in the Rocky Mountain region, where maturation occurred as a result of Paleocene and Eocene basin fill. The present geothermal gradient in the San Juan sag is slightly higher (average 3.5??C/100 m; 1.9??F/100 ft) than the regional average for southern Rocky

  8. SEISMICITY AND VOLCANISM IN THE PACIFIC NORTHWEST: EVIDENCE FOR THE SEGMENTATION OF THE JUAN DE FUCA PLATE.

    USGS Publications Warehouse

    Weaver, Craig S.; Michaelson, Caryl A.

    1985-01-01

    The distributions of earthquakes and late Cenozoic and Quaternary volcanism in Washington and northern Oregon change markedly across two northeast-striking lines, one near Mount Rainier and one near Mount Hood. On the basis of these observations and a comparison with the Nazoa subduction zone, we propose that the Juan de Fuca subduction zone is divided into two segments. Landward of the coastal thrust zone, we suggest the Juan de Fuca plate dips more steeply beneath the southern segment than beneath the northern segment. Refs.

  9. Amphibians and Reptiles of the state of Nuevo León, Mexico

    PubMed Central

    Lemos-Espinal, Julio A.; Smith, Geoffrey R.; Cruz, Alexander

    2016-01-01

    Abstract We compiled a check list of the herpetofauna of Nuevo León. We documented 132 species (23 amphibians, 109 reptiles), representing 30 families (11 amphibians, 19 reptiles) and 73 genera (17 amphibians, 56 reptiles). Only two species are endemic to Nuevo León. Nuevo León contains a relatively high richness of lizards in the genus Sceloporus. Overlap in the herpetofauna of Nuevo León and states it borders is fairly extensive. Of 130 native species, 102 are considered species of Least Concern in the IUCN red list, four are listed as Vulnerable, five are listed as Near Threatened, and four are listed as Endangered. According to SEMARNAT, 78 species are not of conservation concern, 25 are subject to Special Protection, 27 are Threatened, and none are listed as in Danger of Extinction. Given current threats to the herpetofauna, additional efforts to understand the ecology and status of populations in Nuevo León are needed. PMID:27408562

  10. Amphibians and Reptiles of the state of Nuevo León, Mexico.

    PubMed

    Lemos-Espinal, Julio A; Smith, Geoffrey R; Cruz, Alexander

    2016-01-01

    We compiled a check list of the herpetofauna of Nuevo León. We documented 132 species (23 amphibians, 109 reptiles), representing 30 families (11 amphibians, 19 reptiles) and 73 genera (17 amphibians, 56 reptiles). Only two species are endemic to Nuevo León. Nuevo León contains a relatively high richness of lizards in the genus Sceloporus. Overlap in the herpetofauna of Nuevo León and states it borders is fairly extensive. Of 130 native species, 102 are considered species of Least Concern in the IUCN red list, four are listed as Vulnerable, five are listed as Near Threatened, and four are listed as Endangered. According to SEMARNAT, 78 species are not of conservation concern, 25 are subject to Special Protection, 27 are Threatened, and none are listed as in Danger of Extinction. Given current threats to the herpetofauna, additional efforts to understand the ecology and status of populations in Nuevo León are needed. PMID:27408562

  11. Cancer screening participation: comparative willingness of San Juan Puerto Ricans versus New York City Puerto Ricans.

    PubMed Central

    Claudio, Cristina; Katz, Ralph V.; Green, B. Lee; Kressin, Nancy R.; Wang, Min Qi; Russell, Stefanie L.

    2007-01-01

    OBJECTIVES: The specific aim of this study was to determine the self-reported likelihood of New York Puerto Ricans (NYPR) and San Juan Puerto Ricans (SJPR) to participate in: 10 site-specific cancer screenings, cancer-screenings conducted by different specific persons/agencies and cancer-screening under specific conditions of what one was asked to do as a part of cancer screening. METHODS: The Cancer Screening Questionnaire (CSQ) was administered via random-digit-dial telephone interviews to 154 adults living in San Juan, PR and 155 in New York, NY. RESULTS: Although the self-reported willingness to participate across the 10 site-specific cancer screening exams was consistently high in both cities, SJPR had higher rates, as compared to NYPR for all 10 site-specific cancer screening exams in the unadjusted analyses. A similar pattern was observed regarding the influence of both "who conducts the cancer-screening exam" and "what one is asked to do in a cancer-screening exam" as factors in the willingness to participate in such exams. Adjusted multivariate analysis showed that the odds of SJPR participating in skin cancer screening as compared to NYPR, were three-fold higher to participate in skin cancer screening and were two-fold higher to participate in a cancer screening where they have to be interviewed about their alcohol habits. These two observed differences might reflect the effect of acculturation in the NYPR. PMID:17534012

  12. Pb, Sr, and Nd isotopes in basalts and sulfides from the Juan de Fuca Ridge

    SciTech Connect

    Hegner, E.; Tatsumoto, M.

    1987-10-10

    Pb, Sr, Nd isotopes of seven basalt glasses collected by the submersible Alvin from the southern Juan de Fuca Ridge (SJFR) are almost identical (/sup 206/Pb//sup 204/Pbapprox.18.45, /sup 207/Pb//sup 204/Pbapprox.15.47, /sup 208/Pb//sup 204/Pbapprox.37.81, /sup 87/Sr//sup 86/Srapprox.0.70249, /sup 143/Nd//sup 144/Ndapprox.0.51315). Whereas all basalts appear cogenetic, four of the samples have uniform abundances of U, Th, Rb, Nd, Sm, Pb, and Sr, indicating that they are also comagmatic. Two basalt glasses dredged previously at the SJFR have similar isotopic compositions but higher concentrations of U, Th, and Pb. The /sup 206/Pb//sup 204/Pb ratios are intermediate between generally less radiogenic ridge basalts from south of the Juan de Fuca Ridge (JFR) and often more radiogenic basalts from the northern JFR and NE Pacific seamounts. Sr and Nd isotopic compositions closely resemble data of other ridge basalts from the northernmost East Pacific Rise and are intermediate between isotopically more diverse seamount basalts produced nearby.

  13. Progressive migration and anagenesis in Drimys confertifolia of the Juan Fernández Archipelago, Chile.

    PubMed

    López-Sepúlveda, Patricio; Takayama, Koji; Greimler, Josef; Crawford, Daniel J; Peñailillo, Patricio; Baeza, Marcelo; Ruiz, Eduardo; Kohl, Gudrun; Tremetsberger, Karin; Gatica, Alejandro; Letelier, Luis; Novoa, Patricio; Novak, Johannes; Stuessy, Tod F

    2015-01-01

    A common mode of speciation in oceanic islands is by anagenesis, wherein an immigrant arrives and through time transforms by mutation, recombination, and drift into a morphologically and genetically distinct species, with the new species accumulating a high level of genetic diversity. We investigate speciation in Drimys confertifolia, endemic to the two major islands of the Juan Fernández Archipelago, Chile, to determine genetic consequences of anagenesis, to examine relationships among populations of D. confertifolia and the continental species D. winteri and D. andina, and to test probable migration routes between the major islands. Population genetic analyses were conducted using AFLPs and nuclear microsatellites of 421 individuals from 42 populations from the Juan Fernández islands and the continent. Drimys confertifolia shows a wide genetic variation within populations on both islands, and values of genetic diversity within populations are similar to those found within populations of the continental progenitor. The genetic results are compatible with the hypothesis of high levels of genetic variation accumulating within anagenetically derived species in oceanic islands, and with the concept of little or no geographical partitioning of this variation over the landscape. Analysis of the probability of migration within the archipelago confirms colonization from the older island, Robinson Crusoe, to the younger island Alejandro Selkirk. PMID:25292282

  14. History of dredging and filling of lagoons in the San Juan, Puerto Rico

    USGS Publications Warehouse

    Ellis, S.R.

    1976-01-01

    Laguna La Torrecilla, Laguna de Pinones, Laguna San Jose, and Laguna del Condado, in the San Juan, Puerto Rico area, are located within a metropolitan area of more than 1 million people. Bathymetric maps made during the study, in 1973, showed that Lagunas La Torrecilla, San Jose, and del Condado have been modified by dredging and filling; whereas, Laguna de Pinones has remained in a near natural state. Laguna La Torrecilla has been dredged to a depth, in places, of about 18 meters, and Lagunas San Jose and del Condado, in places to about 11 meters. Dredging in the San Juan lagoons has been harmful, beneficial, and in a few instances has had little or no noticeable effect on the water quality. Usually, dredging in the connecting canals has been beneficial if the water entering the lagoons through the canals was of better quality than the water in the lagoon. Dredging in the mouths of lagoons has been beneficial; whereas, filling or blocking the mouths has been harmful. (Woodard-USGS)

  15. Characteristics of suspended sediment in the San Juan River near Bluff, Utah

    USGS Publications Warehouse

    Thompson, K.R.; Mundorff, J.C.

    1982-01-01

    Fluvial-sediment data were collected for the San Juan River near Bluff beginning in 1914 and terminating in 1980. A double-mass curve showed a change in relationship between annual suspended-sediment discharge and annual stream discharge between the water years 1941-44 and 73. Possible causes for these changes in laboratory procedures, and unusually large runoff that occurred in 1941 and 1972. An unknown or unidentified factor may also be involved. The actual reason for this change in relationship may never be fully understood. Navajo Dam apparently has had no significant effect on fluvial sediment at the sampling site. Mean annual suspended sediment discharge in the San Juan River near Bluff was about 25,410,000 tons ranging from 3,234,000 tons in 1978 to 112,400,000 tons in 1941. The use of annual stream discharge to predict annual suspended-sediment discharge at the site will produce poor results because of size and diversity of the basin and the quality of records available. A positive correlation exists between sand concentration and stream discharge at this site, however, considerable variability is evident. This relationship does not exist when stream discharge exceeds 6,000 cubic feet per second. It is recommended that if collection of suspended-sediment records be resumed in this reach of the river an alternative sampling site should be selected and the use of pumping samplers considered because of the remoteness of the area. (USGS)

  16. Creep Transients and Fault Interaction from Repeating Earthquakes Near San Juan Bautista, California

    NASA Astrophysics Data System (ADS)

    Turner, R. C.; Nadeau, R. M.; Burgmann, R.

    2012-12-01

    Along creeping sections of the San Andreas and other faults, small asperities in the fault zone load and fail in characteristic repeating earthquake sequences which can be used as subsurface creepmeters. Here, we use these virtual creepmeters to examine and compare slip rates on both the northwestern end of the creeping section of the San Andreas Fault near San Juan Bautista and on the nearby sub-parallel Sargent Fault, previously observed to have ~3mm/year of right-lateral creep. While creep on the San Andreas increases dramatically in response to the 1989 Loma Prieta earthquake and takes about ten years to resume interseismic rates, the Sargent shows little immediate response. The Sargent rather exhibits a very gradual increase of activity after the Loma Prieta earthquake, consistent with its generally lower interseismic slip rate and with static stress change models that show only a minor increase in the stress along the Sargent. When the SAF resumes its interseismic rate, it begins creeping coherently in time with the Sargent, indicating a mutual driving force in the system. Background seismicity in gray points, newly discovered repeaters in black circles (inset). Boxes show study area. Stars show epicenters of 1989 Loma Prieta EQ, 1998 San Juan Bautista EQ, and 2004 Parkfield EQ.

  17. Dinosaur Footprints in Lower Cretaceous Beds in San Juan Raya, Southern Mexico and the Paleoenvironmental Implications

    NASA Astrophysics Data System (ADS)

    Aceves, D.

    2008-12-01

    Dinosaur footprints were traced at San Juan Raya, an important site in Mexico, a world fossil site. This site is found at South-west of the State of Puebla, within the Biosphere Reserve of Tehuacan-Cuitcatlán, to the southwest of the Tehuacan valley. These footprints were recorded by tracing them on transparent paper at Barranca Agua Nueva, at point 18°18.56´N 97°37´W. Using Jacob´s staff a stratigraphic register was generated from 50 m ascending and descending in stratigraphically direction from the bed where footprints were founded. Bivalbes, nerineas, shell fragments, and trigonias were founded in this sequence as well as cross bedding of clays and fine grain sand, some which display ripples. Fifty two footprints were recorded and five different tracks identified, observing two different sizes. The tracks of dinosaur footprints present the common Teropode ichnites. The succession where dinosaur footprints have been found, are interpreted as a peritidal environment. This investigation contributes to an eco-tourism project of San Juan Raya.

  18. Sub-Seafloor Carbon Dioxide Storage Potential on the Juan de Fuca Plate, Western North America

    SciTech Connect

    Jerry Fairley; Robert Podgorney

    2012-11-01

    The Juan de Fuca plate, off the western coast of North America, has been suggested as a site for geological sequestration of waste carbon dioxide because of its many attractive characteristics (high permeability, large storage capacity, reactive rock types). Here we model CO2 injection into fractured basalts comprising the upper several hundred meters of the sub-seafloor basalt reservoir, overlain with low-permeability sediments and a large saline water column, to examine the feasibility of this reservoir for CO2 storage. Our simulations indicate that the sub-seafloor basalts of the Juan de Fuca plate may be an excellent CO2 storage candidate, as multiple trapping mechanisms (hydrodynamic, density inversions, and mineralization) act to keep the CO2 isolated from terrestrial environments. Questions remain about the lateral extent and connectivity of the high permeability basalts; however, the lack of wells or boreholes and thick sediment cover maximize storage potential while minimizing potential leakage pathways. Although promising, more study is needed to determine the economic viability of this option.

  19. Vacuolate-attached filaments: highly productive Ridgeia piscesae epibionts at the Juan de Fuca hydrothermal vents.

    PubMed

    Kalanetra, Karen M; Nelson, Douglas C

    2010-01-01

    Vacuolate sulfur bacteria with high morphological similarity to vacuolate-attached filaments previously described from shallow hydrothermal vents (White Point, CA) were found at deep-sea hydrothermal vents. These filamentous bacteria grow in dense mats that cover surfaces and potentially provide a significant source of organic carbon where they occur. Vacuolate-attached filaments were collected near vents at the Clam Bed site of the Endeavour Segment of the Juan de Fuca Ridge and from the sediment surface at Escanaba Trough on the Gorda Ridge. A phylogenetic analysis comparing their 16S rRNA gene sequences to those collected from the shallow White Point site showed that all vacuolate-attached filament sequences form a monophyletic group within the vacuolate sulfur-oxidizing bacteria clade in the gamma proteobacteria. Abundance of the attached filaments was quantified over the length of the exterior surface of the tubes of Ridgeia piscesae worms collected from the Clam Bed site at Juan de Fuca yielding a per worm average of 0.070 ± 0.018 cm(3) (n = 4). In agreement with previous results for White Point filaments, anion measurements by ion chromatography showed no detectable internal nitrate concentrations above ambient seawater (n = 9). For one R. piscesae tube worm "bush" at the Easter Island vent site, potential gross epibiont productivity is estimated to be 15 to 45× the net productivity of the worms. PMID:24391244

  20. A Geo-referenced 3D model of the Juan de Fuca Slab and associated seismicity

    USGS Publications Warehouse

    Blair, J.L.; McCrory, P.A.; Oppenheimer, D.H.; Waldhauser, F.

    2011-01-01

    We present a Geographic Information System (GIS) of a new 3-dimensional (3D) model of the subducted Juan de Fuca Plate beneath western North America and associated seismicity of the Cascadia subduction system. The geo-referenced 3D model was constructed from weighted control points that integrate depth information from hypocenter locations and regional seismic velocity studies. We used the 3D model to differentiate earthquakes that occur above the Juan de Fuca Plate surface from earthquakes that occur below the plate surface. This GIS project of the Cascadia subduction system supersedes the one previously published by McCrory and others (2006). Our new slab model updates the model with new constraints. The most significant updates to the model include: (1) weighted control points to incorporate spatial uncertainty, (2) an additional gridded slab surface based on the Generic Mapping Tools (GMT) Surface program which constructs surfaces based on splines in tension (see expanded description below), (3) double-differenced hypocenter locations in northern California to better constrain slab location there, and (4) revised slab shape based on new hypocenter profiles that incorporate routine depth uncertainties as well as data from new seismic-reflection and seismic-refraction studies. We also provide a 3D fly-through animation of the model for use as a visualization tool.

  1. Propagation as a mechanism of reorientation of the Juan de Fuca ridge

    NASA Technical Reports Server (NTRS)

    Wilson, D. S.; Hey, R. N.; Nishimura, C.

    1984-01-01

    A revised model is presented of the tectonic evolution of the Juan de Fuca ridge by propagating rifting. The new model has three different relative rotation poles, covering the time intervals 17.0-8.5 Ma, 8.5-5.0 Ma, and 5.0 Ma to the present. The rotation pole shifts at 8.5 and 5.0 Ma imply clockwise shifts in the direction of relative motion of 10 deg to 15 deg. At each of these shifts, the pattern of propagation reorganizes, and the new ridges formed by propagation are at an orientation closer to orthogonal to the new direction of motion than the orientation of the preexisting ridges. The model, containing a total of seven propagation sequences, shows excellent agreement with the isochrons inferred from the magnetic anomaly data, except in areas complicated by the separate Explorer and Gorda plates. The agreement between model and data near the Explorer plate breaks down abruptly at an age of about 5 Ma, indicating that the probable cause of the rotation pole shift at that time was the separation of the Explorer plate from the Juan de Fuca plate.

  2. Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab

    NASA Astrophysics Data System (ADS)

    Chen, Chuanxu; Zhao, Dapeng; Wu, Shiguo

    2015-04-01

    We used 40,343 P-wave arrival times from 1883 local earthquakes and 105,455 P-wave arrivals from 6361 teleseismic events to study the detailed structure of the Cascadia subduction zone. We conducted tomographic inversions using a starting velocity model which includes the high-velocity subducting Juan de Fuca slab as a priori information. A number of such slab-constrained inversions are conducted by changing the slab thickness and the velocity contrast between the slab and the surrounding mantle. Our optimal 3-D velocity model fits the data much better than that determined by an inversion with a 1-D homogeneous starting model. Our results show that the subducting Juan de Fuca slab has a thickness of 30-50 km and a P-wave velocity of 1-3% higher than that of the surrounding mantle. Beneath the northern and southern parts of the Cascadia, P-wave velocity is lower in the slab and along the slab interface, which may reflect a more hydrated slab and more active slab dehydration there. The lateral velocity variations may indicate different degrees of slab dehydration and forearc mantle serpentinization. The segmentation in episodic tremor and slip (ETS) is also spatially coincident with the velocity heterogeneities, indicating that the ETS occurrence and recurrence interval are controlled by fluid activity in and around the mantle wedge corner.

  3. Seasonal and habitat effects on dengue and West Nile virus vectors in San Juan, Puerto Rico.

    PubMed

    Smith, Joshua; Amador, Manuel; Barrera, Roberto

    2009-03-01

    The presence of West Nile (WNV) and dengue viruses and the lack of recent mosquito surveys in Puerto Rico prompted an investigation on the distribution and abundance of potential arbovirus vectors in the San Juan Metropolitan Area, and their variation with seasons and habitats. We sampled mosquitoes in early and late 2005 in 58 sites from forests, nonforest vegetation, wetlands, and high- and low-density housing areas using ovijars, Centers for Disease Control and Prevention miniature light/CO2 traps, and gravid traps. A total of 28 mosquito species was found. San Juan had potential WNV enzooticvectors (Culex nigripalpus) within and around the city in wetlands and forests, but few were captured in residential areas. A potential WNV bridge vector (Cx. quinquefasciatus) was abundant in urbanized areas, and it was positively correlated with the main dengue vector, Aedes aegypti. High-density housing areas harbored more Ae. aegypti. Container mosquitoes, including Aedes mediovittatus, were more abundant during the climax of the rainy season when most dengue occurs in Puerto Rico. The greatest risk for contracting WNV would be visiting forests and swamps at night. Culex (Culex) and Culex (Melanoconion) mosquito species were more abundant during the transition dry-wet seasons (March-May). PMID:19432067

  4. AgRISTARS: Renewable resources inventory. Land information support system implementation plan and schedule. [San Juan National Forest pilot test

    NASA Technical Reports Server (NTRS)

    Yao, S. S. (Principal Investigator)

    1981-01-01

    The planning and scheduling of the use of remote sensing and computer technology to support the land management planning effort at the national forests level are outlined. The task planning and system capability development were reviewed. A user evaluation is presented along with technological transfer methodology. A land management planning pilot test of the San Juan National Forest is discussed.

  5. Sequence Stratigraphy of the Dakota Sandstone, Eastern San Juan Basin, New Mexico, and its Relationship to Reservoir Compartmentalization

    SciTech Connect

    Varney, Peter J.

    2002-04-23

    This research established the Dakota-outcrop sequence stratigraphy in part of the eastern San Juan Basin, New Mexico, and relates reservoir quality lithologies in depositional sequences to structure and reservoir compartmentalization in the South Lindrith Field area. The result was a predictive tool that will help guide further exploration and development.

  6. 46 CFR 7.145 - Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 1 2013-10-01 2013-10-01 false Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA. 7.145 Section 7.145 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES... of Georgia WA. (a) A line drawn from the northernmost point of Angeles Point to latitude 48°21.1′...

  7. 46 CFR 7.145 - Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 1 2012-10-01 2012-10-01 false Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA. 7.145 Section 7.145 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES... of Georgia WA. (a) A line drawn from the northernmost point of Angeles Point to latitude 48°21.1′...

  8. 46 CFR 7.145 - Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 1 2011-10-01 2011-10-01 false Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA. 7.145 Section 7.145 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES... of Georgia WA. (a) A line drawn from the northernmost point of Angeles Point to latitude 48°21.1′...

  9. 46 CFR 7.145 - Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 1 2014-10-01 2014-10-01 false Strait of Juan de Fuca, Haro Strait and Strait of Georgia WA. 7.145 Section 7.145 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PROCEDURES... of Georgia WA. (a) A line drawn from the northernmost point of Angeles Point to latitude 48°21.1′...

  10. Geology, thermal maturation, and source rock geochemistry in a volcanic covered basin: San Juan sag, south-central Colorado

    SciTech Connect

    Gries, R.R.; Clayton, J.L.; Leonard, C.

    1997-07-01

    The San Juan sag, concealed by the vast San Juan volcanic field of south-central Colorado, has only recently benefited from oil and gas wildcat drilling and evaluations. Sound geochemical analyses and maturation modeling are essential elements for successful exploration and development. Oil has been produced in minor quantities from an Oligocene sill in the Mancos Shale within the sag, and major oil and gas production occurs from stratigraphically equivalent rocks in the San Juan basin to the southwest and in the Denver basin to the northeast. The objectives of this study were to identify potential source rocks, assess thermal maturity, and determine hydrocarbon-source bed relationships. Source rocks are present in the San Juan sag in the upper and lower Mancos Shale (including the Niobrara Member), which consists of about 666 m (2184 ft) of marine shale with from 0.5 to 3.1 wt. % organic carbon. Pyrolysis yields (S{sub 1} + S{sub 2} = 2000-6000 ppm) and solvent extraction yields (1000-4000 ppm) indicate that some intervals within the Mancos Shale are good potential source rocks for oil, containing type II organic matter, according to Rock-Eval pyrolysis assay.

  11. HF (HIGH FREQUENCY) RADAR MEASUREMENTS OF CIRCULATION IN THE EASTERN STRAIT OF JUAN DE FUCA (AUGUST, 1978)

    EPA Science Inventory

    During August, 1978, the surface currents in the Eastern Strait of Juan de Fuca were mapped with a High Frequency (HF) radar system (CODAR). The surface currents were measured simultaneously over several hundred square kilometers at one hour intervals continuously for five days. ...

  12. 78 FR 30270 - Foreign-Trade Zone (FTZ) 61-San Juan, Puerto Rico, Notification of Proposed Production Activity...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE Foreign-Trade Zones Board Foreign-Trade Zone (FTZ) 61--San Juan, Puerto Rico, Notification of Proposed Production Activity, Janssen Ortho LLC (Pharmaceutical Products Production), Gurabo, Puerto Rico The Puerto Rico Trade and Export Company, grantee...

  13. 77 FR 63289 - Foreign-Trade Zone 61-San Juan, PR, Application for Subzone, Coamo Property & Investments, LLC...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-16

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE Foreign-Trade Zones Board Foreign-Trade Zone 61--San Juan, PR, Application for Subzone, Coamo Property & Investments, LLC, Coamo, PR An application has been submitted to the Foreign-Trade Zones Board (the Board)...

  14. How Many Graduate? A Study of the Freshman Class of 1979 at San Juan High School. Revised.

    ERIC Educational Resources Information Center

    Gallant, Steve; Housden, Theresa

    The large number of dropouts estimated by the California State Department of Education has caused concern for educators, lawmakers, and the general public. A 1985 investigation of the graduation rate of the 1979 freshman class of San Juan High School was conducted which also sought to identify logistical problems with the collection of data needed…

  15. 78 FR 75332 - Foreign-Trade Zone 61-San Juan, Puerto Rico Application for Subzone, Parapiezas Corporation...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-11

    ... Foreign-Trade Zones Board Foreign-Trade Zone 61--San Juan, Puerto Rico Application for Subzone, Parapiezas Corporation Amendment of Application The Puerto Rico Trade & Export Company, grantee of FTZ 61, has amended its application requesting subzone status for the facility of Parapiezas Corporation (78 FR 28800,...

  16. 78 FR 30862 - Foreign-Trade Zone 61-San Juan, Puerto Rico; Application for Subzone; Janssen Ortho LLC; Gurabo...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-23

    ... Foreign-Trade Zones Board Foreign-Trade Zone 61--San Juan, Puerto Rico; Application for Subzone; Janssen Ortho LLC; Gurabo, Puerto Rico An application has been submitted to the Foreign-Trade Zones Board (the Board) by the Puerto Rico Trade & Export Company, grantee of FTZ 61, requesting special-purpose...

  17. 78 FR 38359 - Approval of Record of Decision for Relocation of Cattle Point Road, San Juan Island National...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-26

    ... National Park Service Approval of Record of Decision for Relocation of Cattle Point Road, San Juan Island... approved a Record of Decision for the Final Environmental Impact Statement for the relocation of the Cattle... Historical Park will begin to implement design and initiate construction of the Cattle Point Road...

  18. Incorporating Ecosystem Services into Community-level Decision-Making: A San Juan, Puerto Rico Case Study

    EPA Science Inventory

    EPA’s Office of Research and Development’s Sustainable and Healthy Communities Research Program is developing tools and approaches to incorporate ecosystem goods and services concepts into community-level decision-making. The San Juan Community Study is one of a serie...

  19. HF (HIGH FREQUENCY) RADAR MEASUREMENTS OF CIRCULATION IN THE EASTERN STRAIT OF JUAN DE FUCA NEAR PROTECTION ISLAND (JULY, 1979)

    EPA Science Inventory

    During July 1979 the surface currents in the Eastern Strait of Juan de Fuca were mapped with a High Frequency (HF) radar system (CODAR). These currents were measured simultaneously over several hundred square kilometers continuously for five days. The strong tidal currents and es...

  20. Writing Virtue and Indigenous Rights: Juan Bautista De Pomar and the "Relación de Texcoco"

    ERIC Educational Resources Information Center

    Espericueta, José

    2015-01-01

    In his "Relación de Texcoco," Juan Bautista de Pomar (c. 1535-90) takes a political and moral stance against Spanish colonialism in Texcoco and the entire viceroyalty of New Spain. Responding to the "Instrucción y memoria's" (1577) request for information about the history and cultural practices of local populations, Pomar…

  1. 77 FR 75145 - Foreign-Trade Zone 61-San Juan, Puerto Rico; Application for Subzone; Sea World, Inc.; Guaynabo, PR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-19

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE Foreign-Trade Zones Board Foreign-Trade Zone 61--San Juan, Puerto Rico; Application for Subzone; Sea World... for the facility of Sea World, Inc., located in Guaynabo, Puerto Rico. The application was...

  2. 33 CFR 3.35-25 - Sector San Juan Marine Inspection Zone and Captain of the Port Zone.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 1 2012-07-01 2012-07-01 false Sector San Juan Marine Inspection Zone and Captain of the Port Zone. 3.35-25 Section 3.35-25 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY GENERAL COAST GUARD AREAS, DISTRICTS, SECTORS, MARINE INSPECTION ZONES, AND CAPTAIN OF THE PORT ZONES...

  3. 33 CFR 165.1310 - Strait of Juan de Fuca and adjacent coastal waters of Northwest Washington; Makah Whale Hunting...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Strait of Juan de Fuca and adjacent coastal waters of Northwest Washington; Makah Whale Hunting-Regulated Navigation Area. 165.1310 Section 165.1310 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY...

  4. 33 CFR 162.260 - Channel leading to San Juan Harbor, P.R.; use, administration, and navigation.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01 false Channel leading to San Juan Harbor, P.R.; use, administration, and navigation. 162.260 Section 162.260 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PORTS AND WATERWAYS SAFETY INLAND WATERWAYS NAVIGATION REGULATIONS § 162.260...

  5. The Child Development Training Consortium. A Status Report on the San Juan College AACJC-Kellogg Beacon College Project.

    ERIC Educational Resources Information Center

    Beers, C. David; Ott, Richard W.

    The Child Development Training Consortium, a Beacon College Project directed by San Juan College (SJC) is a collaborative effort of colleges and universities in New Mexico and Arizona. The consortium's major objective is to create child development training materials for community college faculty who teach "at-risk" Native American and Hispanic…

  6. A new translational repression element and unusual transcriptional control regulate expression of don juan during Drosophila spermatogenesis.

    PubMed

    Blümer, Nicole; Schreiter, Kay; Hempel, Leonie; Santel, Ansgar; Hollmann, Martin; Schäfer, Mireille A; Renkawitz-Pohl, Renate

    2002-01-01

    The Drosophila don juan (dj) gene encodes a basic protein that is expressed solely in the male germline and shows structural similarities to the linker histone H1. Don Juan is located in two different subcellular structures: in the nucleus during the phase of chromatin condensation and later in the mitochondrial derivatives starting with spermatid individualization. The don juan gene is transcribed in primary spermatocytes under the control of 23 bp upstream in combination with downstream sequences. During meiotic stages and in early spermatid stages don juan mRNA is translationally repressed for several days. Analysis of male sterile mutants which fail to undergo meiosis shows that release of dj mRNA from translational repression is independent of meiosis. In gel retardation assays 60 nucleotides at the end of the dj leader form four major complexes with proteins that were extracted from testes but not with protein extracts from ovaries. Transformation studies prove that in vivo 35 bp within that region of the dj mRNA is essential to confer translational repression. UV cross-linking studies show that a 62 kDa protein specifically binds to the same region within the 5' untranslated region. The dj translational repression element, TRE, is distinct from the translational control element, TCE, described earlier for all members of the Mst(3)CGP gene family. Moreover, expression studies in several male sterile mutants reveal that don juan mRNA is translated in earlier developmental stages during sperm morphogenesis than the Mst(3)CGP mRNAs. This proves that translational activation of dormant mRNAs in spermatogenesis occurs at different time-points which are characteristic for each gene, an essential feature for coordinated sperm morphogenesis. PMID:11744372

  7. Seismic and Acoustic Studies from a Seafloor Array on the Juan de Fuca Ridge

    NASA Astrophysics Data System (ADS)

    McDonald, Mark Armstrong

    This dissertation consists of two related but separate studies, one a refraction seismic study of the oceanic crust and the other an acoustic study of whale behavior in the presence of noise, both using seafloor array data. The goal of the first study was to measure the lateral thickness variability in the extrusive volcanic layer on the Juan de Fuca Ridge. The Juan de Fuca Ridge is a medium rate (6 cm per year full rate), active spreading center, separating the Juan de Fuca and Pacific plates. It is a site of volcanic eruptions, associated with creation of new oceanic crust, and hydrothermal vents which are important in the chemical balance of the oceans. To better understand the mechanisms controlling hydrothermal venting and the creation of new crust, a seismic refraction survey was conducted over a 20 km by 30 km area of the ridge. This survey, conducted in August of 1990, used airguns as energy sources and ocean bottom seismometers as recorders. A 3-dimensional traveltime inversion was used to interpret extrusive volcanic layer thickness changes of 300 m, occurring over less than several kilometers laterally. These thickness changes are interpreted as lava accumulations on the low side of listric faults in an episodic spreading system. The traveltime inversion also reveals a large horizontal seismic velocity anisotropy which is confined to the upper 500 m of crust. Compressional velocities are 3.35 km/s in the ridge strike direction and 2.25 km/s across strike. This anisotropy is believed to be caused by oriented fractures within the extrusive layer. The second study involved the tracking and analysis of whale vocalizations which were recorded on the array 10 percent of the time. The goal was to determine if noises such as generated by the airguns, shipping or earthquakes affected the behavior of these fin and blue whales. The vocalization patterns allow analysis of swimming speed, direction, respiration cycle and call interaction. While no clear noise

  8. Effects of uranium development on erosion and associated sedimentation in southern San Juan Basin, New Mexico

    USGS Publications Warehouse

    Cooley, Maurice E.

    1979-01-01

    A reconnaissance was made of some of the effects of uranium development on erosion and associated sedimentation in the southern San Juan Basin, where uranium development is concentrated. In general, the effects of exploration on erosion are minor, although erosion may be accelerated by the building of access roads, by activities at the drilling sites, and by close concentration of drilling sites. Areas where the greatest effects on erosion and sedimentation from mining and milling operations have occurred are: (1) in the immediate vicinity of mines and mills, (2) near waste piles, and (3) in stream channels where modifications, such as changes in depth have been caused by discharge of excess mine and mill water. Collapse of tailings piles could result in localized but excessive erosion and sedimentation.

  9. Seismic anisotropy of the shallow crust at the Juan de Fuca Ridge

    USGS Publications Warehouse

    Almendros, J.; Barclay, A.H.; Wilcock, W.S.D.; Purdy, G.M.

    2000-01-01

    Microearthquake data recorded on four ocean bottom seismometers are used to study shear-wave splitting on the Endeavour Segment of the Juan de Fuca Ridge. The covariance matrix decomposition method is used to determine the sensor orientation from explosive shot data and to estimate the anisotropy parameters for 238 earthquake records. At three of the four sites, the results show a remarkably consistent fast direction parallel to the ridge axis. The time delays between the fast and the slow waves range from 40 to 200 ms, with an average of 90 ms. They are not clearly related to earthquake range, focal depth or source-receiver azimuth. The splitting of the shear waves is interpreted as an effect of structural anisotropy due to the presence of ridge-parallel cracks in the shallow crust. If we assume that anisotropy is concentrated in the upper 1-2 km, the splitting times require a high crack density of ~0.1.

  10. “Don Juan-Fracture” as a Hint to Aortic Isthmus Rupture

    PubMed Central

    Suksompong, Sirilak; von Bormann, Benno

    2014-01-01

    We report a case of thoracic aortic rupture after blunt trauma in a 23-year-old male patient. The initial investigation found no external injury or bleeding, only a slightly widened mediastinum and a broken left calcaneus. Abdominal lavage was negative, biochemistry was normal, and breathing and oxygenation were not compromised. When changing his position during diagnostics, the patient all of a sudden developed cardiac arrest and typical signs of hypovolemic shock. An immediate sternotomy was done without any further diagnostics on suspicion of aortic isthmus injury. A circular avulsion at the ligamentum arteriosum was found as assumed and repaired under cardiopulmonary bypass. The patient left the hospital for rehabilitation after 12 days in adequate health status. Biodynamics of blunt trauma after high-speed frontal impact and the relationship between calcaneus fracture, called “Don-Juan fracture,” and aortic rupture at the site of ligamentum arteriosum are discussed. PMID:25478249

  11. Structurally controlled and aligned tight gas reservoir compartmentalization in the San Juan and Piceance Basins

    SciTech Connect

    Decker, A.D.; Kuuskraa, V.A.; Klawitter, A.L.

    1995-10-01

    Recurrent basement faulting is the primary controlling mechanism for aligning and compartmentalizing upper Cretaceous aged tight gas reservoirs of the San Juan and Piceance Basins. Northwest trending structural lineaments that formed in conjunction with the Uncompahgre Highlands have profoundly influenced sedimentation trends and created boundaries for gas migration; sealing and compartmentalizing sedimentary packages in both basins. Fractures which formed over the structural lineaments provide permeability pathways which allowing gas recovery from otherwise tight gas reservoirs. Structural alignments and associated reservoir compartments have been accurately targeted by integrating advanced remote sensing imagery, high resolution aeromagnetics, seismic interpretation, stratigraphic mapping and dynamic structural modelling. This unifying methodology is a powerful tool for exploration geologists and is also a systematic approach to tight gas resource assessment in frontier basins.

  12. An isotopic and chemical study of Lake Vanda and Don Juan Pond, Antarctica

    NASA Astrophysics Data System (ADS)

    Friedman, I.; Rafter, A.; Smith, G. I.

    Temperature measurements made in Lake Vanda and in the lake subbottom sediments show that the high temperatures in the lake are not due to geothermal heat flow, but are probably trapped solar energy. On the basis of Sr-87/86 ratios the salts in Lake Vanda can be derived by a mixture of 58% weathered rock plus 42% from sea water or precipitation. Loss of efflorescences high in sodium, potassium and magnesium by high winds can yield the salt compositions present in both Lake Vanda and Don Juan Pond. From isotopic data on deuterium, O-18, C-13, Sr-87/86, S-34 as well as from chemical data on Lake Vanda waters, interstitial brines contained in the subsurface sediment and C-14 dates a lake history is proposed.

  13. Analysis of The Surface Radiative Budget Using ATLAS Data for San Juan, Puerto Rico

    NASA Technical Reports Server (NTRS)

    Luvall, Jeffrey C.; Rickman, D. L.; Gonzalez, J.; Comarazamy, Daniel; Picon, Ana

    2007-01-01

    The additional beating of the air over the city is the result of the replacement of naturally vegetated surfaces with those composed of asphalt, concrete, rooftops and other man-made materials. The temperatures of these artificial surfaces can be 20 to 40 C higher than vegetated surfaces. This produces a dome of elevated air temperatures 5 to 8 C greater over the city, compared to the air temperatures over adjacent rural areas. Urban landscapes are a complex mixture of vegetated and nonvegetated surfaces. It is difficult to take enough temperature measurements over a large city area to characterize the complexity of urban radiant surface temperature variability. The NASA Airborne Thermal and Land Applications Sensor (ATLAS) operates in the visual and IR bands was used in February 2004 to collect data from San Juan, Puerto Rico with the main objective of investigating the Urban Heat Island (UHI) in tropical cities.

  14. Biogeochemical variability of plants at native and altered sites, San Juan Basin, New Mexico

    USGS Publications Warehouse

    Gough, L.P.; Severson, R.C.

    1981-01-01

    The San Juan Basin is becoming a major energy resource region. The anticipated increase in strip mining for coal can be expected to alter the geochemical and biogeochemical environment. because such activities destroy the native vegetation communities, rearrange the rock strata, and disrupt natural soil development. This study investigated the variability in the biogeochemistry of native plant species at both undisturbed and altered sites and assessed the importance of the observed differences. Three studies are involved in this investigation: Study 1, the biogeochemical variability of native species found at sites throughout that part of the basin underlain by economically recoverable coal; Study 2, the biogeochemical variability of native species growing on soils considered favorable for use in the topsoiling of spoil areas; and Study 3, the biogeochemical variability of native species on rehabilitated sites at the San Juan coal mine. Summary statistics for concentrations of 35 elements (and ash yield) are reported in Study 1 for galleta grass, broom snakeweed, and fourwing saltbush. The concentrations of manganese, molybdenum, nickel, and uranium (and possibly iron and selenium) in galleta show regional patterns, with the highest values generally found in the south-central region and western edge of the study area. Differences in the concentration of elements between species was generally subtle (less than a factor of two) except for the following: ash yield of saltbush was two times that of the other plants; boron in snakeweed and saltbush was four times greater than in galleta; iron in galleta was two times greater than in saltbush; and, calcium, magnesium, potassium, phosphorus, and sulfur were generally highest in saltbush. Summary statistics (including the 95-percent expected range) for concentrations of 35 elements (and ash yield) are reported from Study 2 for galleta and broom snakeweed growing on the Sheppard, Shiprock, and Doak soil association

  15. San Juan National Forest Land Management Planning Support System (LMPSS) requirements definition

    NASA Technical Reports Server (NTRS)

    Werth, L. F. (Principal Investigator)

    1981-01-01

    The role of remote sensing data as it relates to a three-component land management planning system (geographic information, data base management, and planning model) can be understood only when user requirements are known. Personnel at the San Juan National Forest in southwestern Colorado were interviewed to determine data needs for managing and monitoring timber, rangelands, wildlife, fisheries, soils, water, geology and recreation facilities. While all the information required for land management planning cannot be obtained using remote sensing techniques, valuable information can be provided for the geographic information system. A wide range of sensors such as small and large format cameras, synthetic aperture radar, and LANDSAT data should be utilized. Because of the detail and accuracy required, high altitude color infrared photography should serve as the baseline data base and be supplemented and updated with data from the other sensors.

  16. Paleoclimatic inferences from an isotopic investigation of groundwater in the central San Juan Basin, New Mexico

    NASA Astrophysics Data System (ADS)

    Phillips, Fred M.; Peeters, Leslie A.; Tansey, Michael K.; Davis, Stanley N.

    1986-09-01

    Groundwater from the Ojo Alamo and Nacimiento aquifers in the central San Juan Basin. New Mexico, has yielded 14C ages ranging from modern to 35,000 yr B.P. The Pleistocene-age samples are characterized by a stable isotope content about 25‰ lighter in D and 3‰ lighter in 18O than modern precipitation and groundwater. We attribute this difference to a colder mean annual temperature and perhaps increased winter precipitation. Consideration of various factors controlling the stable isotope composition of the groundwater allows estimation of a 5° to 7°C temperature decrease during the late Wisconsin, accompanied by increased effective precipitation. A similar estimate of the temperature change is obtained from noble-gas paleothermometry. These data support a model of moderately cooler late Pleistocene climate in the American Southwest characterized by summers with less precipitation than today, but wetter winters.

  17. Noble gases in vent water from the Juan de Fuca Ridge

    SciTech Connect

    Kennedy, B.M. )

    1988-07-01

    Hydrothermal vent fluids collected with the DSRV Alvin from the southern limb of the Juan de Fuca Ridge are chemically unique, having chloride concentrations {approximately}2 times ambient seawater. The same fluids contain noble gases in relative abundances like 2{degree}C air-saturated seawater, the expected recharge composition. However, the absolute noble gas abundances are depleted by {approximately}30% relative to seawater. The combination of very high chloride and moderately depleted noble gases appears to require formation of a Cl-rich, gas-free brine by phase separation. This brine is mixed with recharge seawater at temperatures in excess of {approximately}340{degree}C and, therefore, deep in the hydrothermal system.

  18. Mineral resources of the Behind the Rocks Wilderness Study Area, Grand and San Juan counties, Utah

    SciTech Connect

    Patterson, C.G.; Toth, M.I.; Case, J.E.; Green, G.N.; Barton, H.N.; Thompson, J.R.

    1988-01-01

    The Behind the Rocks Wilderness Study Area consists of 12,635 acres in Grand and San Juan counties, Utah. This study area is on the west flank of a northwest-trending collapsed salt anticline near Moab, Utah, and is underlain by gently west dipping, highly fractured sedimentary rocks of Paleozoic and Mesozoic age. Inferred subeconomic resources of potash and halite in the subsurface, and sandstone at the surface occurs in the Behind the Rocks Wilderness Study Area. This study area has a high potential for undiscovered resources of oil and gas, a low potential for undiscovered resources of uranium, vanadium, copper, gold, silver, other metals, and geothermal energy, and an unknown potential for the rare-earth mineral, braitschite. There is no resource potential for coal.

  19. U, Th, and Pb isotopes in hot springs on the Juan de Fuca Ridge

    NASA Technical Reports Server (NTRS)

    Chen, J. H.

    1987-01-01

    Concentrations and isotopic compositions of U, Th, and Pb in three hydrothermal fluids from the Juan de Fuca Ridge were determined from samples obtained by the Alvin submersible. The samples were enriched in Pb and Th relative to deep-sea water, and were deficient in U. No clear relationship with Mg was found, suggesting nonideal mixing between the hot hydrothermal fluids and the cold ambient seawater. Values for U-234/U-238 have a seawater signature, and show a U-234 enrichment relative to the equilibrium value. The Pb isotopic composition has a uniform midocean ridge basalt signature, and it is suggested that Pb in these fluids may represent the best average value of the local oceanic crust.

  20. Submersible observations along the southern Juan de Fuca Ridge: 1984 Alvin program.

    USGS Publications Warehouse

    Normark, W.R.; Morton, J.L.; Ross, S.L.

    1987-01-01

    In September 1984, the research submersible Alvin provided direct observations of three major hydrothermal vent areas along the southernmost segment of the Juan de Fuca Ridge (JFR). The submersible operations focuses on specific volcanologic, structural, and hydrothermal problems that had been identified during the preceding 4 years of photographic, dredging, acoustic imaging, and geophysical studies along a 12 km long section of the ridge. A continuously maintained (from 1981 to the present) net of seafloor-anchored acoustic transponders allowed the observations from Alvin to be directly tied to all previous USGS data sets and NOAA water column surveys from 1984 to the present. We review the dive program and present a brief synthesis of the geology of the vent sites together with sample and track line compilations.-from Authors

  1. Pb, Sr, and Nd isotopes in basalts and sulfides from the Juan de Fuca Ridge

    NASA Technical Reports Server (NTRS)

    Hegner, E.; Tatsumoto, M.

    1987-01-01

    Isotopic Pb, Sr, and Nd data were collected by the Alvin submersible from seven basalt glasses in the southern Juan de Fuca Ridge (JFR), giving similar ratios for Pb-206/Pb-204 of about 18.45, for Pb-207/Pb-204 of about 15.47, for Pb-208/Pb-204 of about 37.81, for Sr-87/Sr-86 of about 0.70249, and for Nd-143/Nd-144 of about 0.51315. Data suggest that the basalts are all cogenetic, and that four of the samples are also comagmatic. It is concluded that isotopic data for the JFR and seamount basalts provide additional support for the mantle blob cluster model (Allegre et al., 1984), suggesting the involvement of multiple components in the genesis of ridge basalts, and including an unusual end-member that has nonradiogenic Sr and variable Pb-206/Pb-204 isotopic compositions.

  2. Exploración del Nuevo Laboratorio Científico de Marte

    NASA Video Gallery

    Únase a Fernando Abilleira, un analista de trayectoria de la NASA para la Oficina de Exploración de Marte, y conozca las nuevas tecnologías que el nuevo robot Curiosity del Laboratorio Científico d...

  3. Un Dia Nuevo for Schools. 2000 & Beyond: The Changing Face of American Schools.

    ERIC Educational Resources Information Center

    Zehr, Mary Ann

    2000-01-01

    This issue, the third in a series on the demographic forces shaping public education in the United States, examines the effect of the influx of Hispanic American and Indian immigrants. The first section, "Una Dia Nuevo for Schools," discusses how schools must adjust as Hispanic immigrants fan out to areas beyond those where they have traditionally…

  4. Nuevos Horizontes, James Monroe High School, 1987-1988. Evaluation Section Report. OREA Report.

    ERIC Educational Resources Information Center

    Berney, Tomi D.; Lista, Carlos

    Proyecto Nuevos Horizontes (Project New Horizons) at James Monroe High School (New York City) served 328 students of limited English proficiency (LEP) in grades 9-12 during the final year of a 3-year funding cycle. The project's purpose was to build on the strengths of the school's extensive computer-assisted instructional program in order to…

  5. James Monroe High School Proyecto Nuevos Horizontes, 1985-1986. OEA Evaluation Report.

    ERIC Educational Resources Information Center

    New York City Board of Education, Brooklyn. Office of Educational Assessment.

    Proyecto Nuevos Horizontes, a 3-year Title VII-funded bilingual education program, serves 287 Spanish speaking students at James Monroe High School (Bronx, New York). This report evaluates the project's first year of operation, 1985-86. The report contains an introduction describing the school and project goals; information on student…

  6. James Monroe High School Proyecto Nuevos Horizontes, 1986-1987. OEA Evaluation Report.

    ERIC Educational Resources Information Center

    Martinez, Ana L.; And Others

    In its second year of Title VII funding, James Monroe High Schools's Proyecto Nuevos Horizontes (Project New Horizons) served 344 limited-English-speaking recent arrivals from Latin America and the Caribbean, in grades 9 through 12. The program has built on the strengths of the high school's extensive computer-assisted instruction (CAI) program,…

  7. Comprehensive Education Bolivarian-Style: The Alternative School in Barrio Pueblo Nuevo, Venezuela

    ERIC Educational Resources Information Center

    Cole, Mike

    2014-01-01

    In this article, the author traces revolutionary developments in an alternative school in Barrio Pueblo Nuevo, Mérida, in the Bolivarian Republic of Venezuela, a school that caters for students between 4 and 14. He begins by recounting some fieldwork done at the school on his behalf by Edward Ellis in 2010. He goes on to discuss a video made at…

  8. U, Th, and Pb isotopes in hot springs on the Juan de Fuca Ridge

    SciTech Connect

    Chen, J.H.

    1987-10-10

    The concentrations and isotopic compositions of U, Th, and Pb in three hydrothermal fluids from the Juan de Fuca Ridge were determined. The samples consisted of 10.2--57.6% of the pure hydrothermal end-members based on Mg contents. The Pb contents of the samples ranged from 34 to 87 ng/g, U from 1.3 to 3.0 ng/g, and Th from 0.2 to 7.7 pg/g. These samples showed large enrichments of Pb and Th relative to deep-sea water and some depletion of U. They did not show coherent relationships with Mg, however, indicating nonideal mixings between the hot hydrothermal fluids and cold ambient seawater. Particles filtered from these hydrothermal fluids contained significant amounts of Th and Pb which may effectively increase the concentration of these elements in the fluids when acidified. The /sup 234/U//sup 238/U values in all samples show a /sup 234/U enrichment relative to the equilibrium value and have a seawater signature. The Pb isotopic composition of the Juan de Fuca hydrothermal fluids resembles that of 21 /sup 0/N East Pacific Rise and has a uniform mid-ocean ridge basalt signature. The hydrothermal systems at oceanic spreading ridges have circulated through a large volume of basalts. Therefore Pb in these fluids may represent the best average value of the local oceanic crust. From the effects of U deposition from seawater to the crust and Pb extraction from rock to the ocean, the U/Pb ratio in the hydrothermally altered oceanic crust may be increased significantly. copyright American Geophysical Union 1987

  9. Is the Juan Fernandez Ridge (nazca Plate) a Deep-Mantle Hot SPOT Trail?

    NASA Astrophysics Data System (ADS)

    Lara, L. E.; Selles, D.; Díaz, A.; Piña-Gauthier, M.

    2011-12-01

    The Juan Fernández Ridge on the oceanic Nazca plate is thought to be a classic hot spot trail because of the apparent westward rejuvenation of the eruptive ages. Geochronological data is still scarce to prove this is the case, and other hypothesis should be taken into account. There are a few constrains, like the ca. 9 Ma Ar-Ar age of the O'Higgins seamount (115 km from the Chile-Perú trench), published K-Ar ages of ca. 3-4 Ma in Robinson Crusoe island (580 km from the trench) and ca. 1 Ma in Alejandro Selkirk (180 km further west). New reconnaissance K-Ar ages in Robinson Crusoe yield ca. 1-3 Ma, which partially overlap with the age of Alejandro Selkirk, breaking the expected age progression given that the Nazca plate moves eastwards at ca. 6-8 cm/yr. New geological mapping also shows a sharp unconformity between the older, strongly altered sequences and more recent, post-erosional volcanic piles, where only the vent facies have disappeared. A fixed deep-mantle plume origin for Pacific hot spots has been widely debated and concurrent phenomena arose as a possible explanation for non-linear age progressions and/or long-lived volcanic activity. In fact, intraplate regional tectonics, plume displacement, and mantle heterogeneities could be the main factor of the ridge architecture or the mask for a first-order linear trend. An ongoing mapping and dating effort is aimed to understand the evolution of the Juan Fernández Ridge, testing the main hypothesis. Fondecyt grant 110966 is acknowledged for financial support.

  10. Ordovidan K-bentonites in the Precordillera of San Juan and its tectomasmatic significance

    USGS Publications Warehouse

    Cingolani, C.A.; Huff, W.; Bergstrom, S.; Kolata, D.

    1997-01-01

    A succession of approximately 35 early Middle Ordovician K-bentonite beds are exposed in the Precordillera region near the town of Jachal, in San Juan Province (at Cerro Viejo and La Chilca sections). They occur in argillaceous limestone in the upper part of the San Juan Limestone and in the interbedded shales and mudstones at the base of the overlying Los Azules Formation. Total thickness of the K-bentonite-bearing interval is 23 m and individual beds range from 1 to 65 cm thick. An essentially Arenig-Llanvirn age for the K-bentonite succession is indicated by the presence of graptolites diagnostic of the Paraglossograptus tentaculatus Zone and conodonts indicating the Eoplacognathus suecicus Zone. The bentonites consist mainly of Rl ordered illite/smectite, characteristic of most of the lower Paleozoic K-bentonites, plus volcanogenic crystals. Similar to other K-bentonites, these probably represent the distal, glass-rich portion of fall-out ash beds derived from collision zone explosive volcanism. The geochemical data and preliminary plots on the magmatic discrimination diagram indicate the parental magma was of rhyolite to trachyandesite composition. Tectonic discrimination diagrams show the setting of Cerro Viejo ash layers as falling on the boundary between volcanic arc and within plate rocks, typical of collision margin felsic volcanic rocks. U-Pb isotope dating for two zircon fractions from one sample show a lower concordia intercept of 461, +7-10 Ma coincident with the biostratigraphic age. Thus, they have important implications for the origin and early history of the allochtonous Precordillera terrane and the Pacific margin of South America. Furthermore, they are potentially important in interpretations of the paleogeographic relations of Laurentia and Gondwana during Ordovician time. ?? 1997 Asociacio??n Geolo??gica Argentina.