Structure and mechanics of the San Andreas–San Gregorio fault junction, San Francisco, California
Tom Parsons, Terry R. Bruns, Ray W. Sliter
2005, Geochemistry, Geophysics, and Geosystems (6)
[1] The right‐lateral San Gregorio and San Andreas faults meet west of the Golden Gate near San Francisco. Coincident seismic reflection and refraction profiling across the San Gregorio and San Andreas faults south of their junction shows the crust between them to have formed shallow extensional basins that are dissected...
Summary of sediment data from the Yampa river and upper Green river basins, Colorado and Utah, 1993-2002
John G. Elliott, Steven P. Anders
2005, Scientific Investigations Report 2004-5242
The water resources of the Upper Colorado River Basin have been extensively developed for water supply, irrigation, and power generation through water storage in upstream reservoirs during spring runoff and subsequent releases during the remainder of the year. The net effect of water-resource development has been to substantially modify the...
Development of a local meteoric water line for southeastern Idaho, western Wyoming, and south-central Montana
Lyn Benjamin, LeRoy L. Knobel, L. Flint Hall, L. DeWayne Cecil, Jaromy R. Green
2005, Scientific Investigations Report 2004-5126
Linear-regression analysis was applied to stable hydrogen (H) and oxygen (O) isotope data in 72 snow-core and precipitation samples collected during 1999-2001 to determine the Local Meteoric Water Line (LMWL) for southeastern Idaho, western Wyoming, and south-central Montana. On the basis of (1) residuals from the regression model, (2) comparison...
High-resolution seismic-reflection image of the Chesapeake Bay impact structure, NASA Langley Research Center, Hampton, Virginia
Rufus D. Catchings, David S. Powars, Gregory Gohn, Mark R. Goldman
2005, Professional Paper 1688-I
A 1-kilometer-long (0.62-mile-long) seismic reflection and refraction profile collected at the National Aeronautics and Space Administration (NASA) Langley Research Center, Hampton, Va., provides a detailed image of part of the annular trough of the buried, 35-million-year-old Chesapeake Bay impact structure. This profile passes within 5 meters (m; 16.4 feet (ft))...
Modeling hydrodynamics, temperature, and water quality in Henry Hagg Lake, Oregon, 2000-03
Annette B. Sullivan, Stewart A. Rounds
2005, Scientific Investigations Report 2004-5261
The two-dimensional model CE-QUAL-W2 was used to simulate hydrodynamics, temperature, and water quality in Henry Hagg Lake, Oregon, for the years 2000 through 2003. Input data included lake bathymetry, meteorologic conditions, tributary inflows, tributary temperature and water quality, and lake outflows. Calibrated constituents included lake hydrodynamics, water temperature, orthophosphate, total...
Paleoceanographic history of the Guaymas Basin, Gulf of California, during the past 15,000 years based on diatoms, silicoflagellates, and biogenic sediments
John A. Barron, David Bukry, Walter E. Dean
2005, Marine Micropaleontology (56) 81-102
High-resolution records of calcium carbonate, biogenic opal, diatoms, and silicoflagellates from western Guaymas Basin gravity core GGC55 and piston core JPC56 and eastern Guaymas Basin DSDP Site 480 reveal a complex paleoceanographic history of the central Gulf of California during the past 15,000 years. Prior to ∼ 6.2 ka, the eastern...
Petrologic constraints on the thermal structure of the Cascades arc
William P. Leeman, Jared F. Lewis, Russell C. Evarts, Richard M. Conrey, Martin J. Streck
2005, Journal of Volcanology and Geothermal Research (140) 67-105
Primitive late Cenozoic basaltic lavas from the Cascades volcanic arc near latitude 46°N comprise two distinct compositional groups. Group I includes samples with low Ba/Nb (<20) and other compositional similarities to oceanic island and MORB lavas from within-plate settings. In contrast, Group II exhibits enrichment of Ba and large-ion lithophile...
Sediment-hosted lead-zinc deposits: A global perspective
David L. Leach, Donald F. Sangster, Karen D. Kelley, Ross R. Large, G. Garven, Cameron R. Allen, J. Gutzmer, Steve Walters
2005, Book chapter, Economic geology: One hundredth anniversary volume
Sediment-hosted Pb-Zn deposits contain the world’s greatest lead and zinc resources and dominate worldproduction of these metals. They are a diverse group of ore deposits hosted by a wide variety of carbonate andsiliciclastic rocks that have no obvious genetic association with igneous activity. A range of ore-forming processes in a...
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2004
Charles C. Schwartz, Mark A. Haroldson, Karrie K. West, editor(s)
2005, Report
The contents of this Annual Report summarize results of monitoring and research from the 2004 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. The study team continues to work on issues associated with counts of unduplicated females with cubs-of-the-year (COY). These counts...
Environmental exposure modeling and monitoring of human pharmaceutical concentrations in the environment
D.J. Versteeg, A. C. Alder, V. L. Cunningham, D.W. Kolpin, R. Murray-Smith, T. Ternes
2005, Book chapter, Human pharmaceuticals: Assessing the impacts on aquatic ecosystems
Human pharmaceuticals are receiving increased attention as environmental contaminants. This is due to their biological activity and the number of monitoring programs focusing on analysis of these compounds in various environmental media and compartments. Risk assessments are needed to understand the implications of reported concentrations; a fundamental part of the...
Unsaturated zone flow processes
John R. Nimmo
2005, Book chapter, Encyclopedia of hydrological sciences, part 13, groundwater
Water flow in the unsaturated zone is greatly influenced by unsaturated hydrostatics (water content, energy, pressure, and retention) and by unsaturated hydrodynamics (diffuse flow and preferential flow). Important multiphase processes include the transport of gases, nonaqueous liquids, and solid particles. Numerous means are available for determination of unsaturated conditions and...
Sexual differentiation in the distribution potential of northern jaguars (Panthera onca)
Erin E. Boydston, Carlos A. Lopez Gonzalez
2005, Proceedings RMRS-P-36
We estimated the potential geographic distribution of jaguars in the southwestern United States and northwestern Mexico by modeling the jaguar ecological niche from occurrence records. We modeled separately the distribution of males and females, assuming records of females probably represented established home ranges while male records likely included dispersal movements....
Modeling ground-water flow and quality
Leonard F. Konikow, Pierre D. Glynn
O. Selinus, editor(s)
2005, Book chapter, Essentials of medical geology
No abstract available....
Lake whitefish and Diporeia spp. in the Great lakes: an overview
Thomas F. Nalepa, Lloyd C. Mohr, Bryan A. Henderson, Charles P. Madenjian, Philip J. Schneeberger
2005, Technical Report 66
Because of growing concern in the Great Lakes over declines in abundance and growth of lake whitefish (Coregonus clupeaformis) and declines in abundance of the benthic amphipod Diporeia spp., a workshop was held to examine past and current trends, to explore trophic links, and to discuss the latest research results...
Historical development of simulation models of recreation use
J. W. van Wagtendonk, D.N. Cole
2005, General Technical Report RMS-GTR-143
No abstract available at this time...
Insider censoring: Distortion of data with nondetects
D.R. Helsel
2005, Human and Ecological Risk Assessment (11) 1127-1137
Environmental data often include low-level concentrations below reporting limits. These data may be reported as "<RL," where RL is one of several types of reporting limits. Some values also may be reported as a single number, but flagged with a qualifier (J-values) to indicate a difference in precision as compared...
Percolation and transport in a sandy soil under a natural hydraulic gradient
Christopher T. Green, David A. Stonestrom, Barbara A. Bekins, Katherine C. Akstin, Marjorie S. Schulz
2005, Water Resources Research (41)
Unsaturated flow and transport under a natural hydraulic gradient in a Mediterranean climate were investigated with a field tracer experiment combined with laboratory analyses and numerical modeling. Bromide was applied to the surface of a sandy soil during the dry season. During the subsequent rainy season, repeated sediment sampling tracked...
Part 2: A field study of enhanced remediation of Toluene in the vadose zone using a nutrient solution
J.A. Tindall, E.P. Weeks, M. Friedel
2005, Water, Air, & Soil Pollution (168) 359-389
The objective of this study was to test the effectiveness of a nitrate-rich nutrient solution and hydrogen peroxide (H2O2) to enhance in-situ microbial remediation of toluene in the unsaturated zone. Three sand-filled plots were tested in three phases (each phase lasting approximately 2 weeks). During the control phase, toluene...
Stress distribution along the Fairweather-Queen Charlotte transform fault system
C. G. Bufe
2005, Bulletin of the Seismological Society of America (95) 2001-2008
Tectonic loading and Coulomb stress transfer are modeled along the right-lateral Fairweather-Queen Charlotte transform fault system using a threedimensional boundary element program. The loading model includes slip below 12 km along the transform as well as motion of the Pacific plate, and it is consistent with most available Global Positioning...
The effects of earthquake measurement concepts and magnitude anchoring on individuals' perceptions of earthquake risk
R. Celsi, M. Wolfinbarger, D. Wald
2005, Earthquake Spectra (21) 987-1008
The purpose of this research is to explore earthquake risk perceptions in California. Specifically, we examine the risk beliefs, feelings, and experiences of lay, professional, and expert individuals to explore how risk is perceived and how risk perceptions are formed relative to earthquakes. Our results indicate that individuals tend to...
Prevalence of agglutinating antibodies to Toxoplasma gondii and Sarcocystis neurona in beavers (Castor canadensis) from Massachusetts
C.N. Jordan, T. Kaur, K. Koenen, S. DeStefano, A.M. Zajac, D. S. Lindsay
2005, Journal of Parasitology (91) 1228-1229
The present study examined the seroprevalence of Toxoplasma gondii and Sarcocystls neurona in a population of beavers (Castor canadensis) from Massachusetts. Sixty-two blood samples were collected during the field seasons over 3 consecutive years from different animals. Blood was collected onto filter paper and shipped to the Department of Biomedical...
Geologic controls of subdivision damage near Denver, Colorado
D.C. Noe
2005, Journal of Geotechnical and Geoenvironmental Engineering (131) 1080-1096
This case study investigates the geologic controls on damaging ground deformations in a residential subdivision near Denver, Colo. Moderate to severe damage has occurred in certain areas where linear, parallel heave features with up to 0.3 in (1 ft) of differential displacement have formed across roads and under houses. Other...
Comparison of methods used to estimate conventional undiscovered petroleum resources: World examples
Thomas S. Ahlbrandt, T. R. Klett
2005, Conference Paper, Natural Resources Research
Various methods for assessing undiscovered oil, natural gas, and natural gas liquid resources were compared in support of the USGS World Petroleum Assessment 2000. Discovery process, linear fractal, parabolic fractal, engineering estimates, PETRIMES, Delphi, and the USGS 2000 methods were compared. Three comparisons of these methods were made in: (1)...
Surface energy exchanges along a tundra-forest transition and feedbacks to climate
J. Beringer, F. S. Chapin III, Catharine Copass Thompson, A. D. McGuire
2005, Agricultural and Forest Meteorology (131) 143-161
Surface energy exchanges were measured in a sequence of five sites representing the major vegetation types in the transition from arctic tundra to forest. This is the major transition in vegetation structure in northern high latitudes. We examined the influence of vegetation structure on the rates of sensible heating and...
Spatiotemporal evolution of a transient slip event on the San Andreas fault near Parkfield, California
J.R. Murray, P. Segall
2005, Journal of Geophysical Research B: Solid Earth (110) 1-12
In 1993 several baselines of the two-color electronic distance meter (EDM) network at Parkfield, California, deviated from their long-term rates, coincident with anomalous observations from nearby strain meters and a creep meter, as well as an increase in microseismicity. Between October 1992 and December 1994, three M ??? 4.5 earthquakes...
