Nicasio Sepulveda
2006, Scientific Investigations Report 2005-5233
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Publication Extents
Not all publications have extents, not all extents are completely accurateI. M. Farnham, T. P. Rose, E. M. Kwicklis, R. L. Hershey, James B. Paces, W. M. Fryer
2006, Technical Report 99205-070
This report describes the results of a comprehensive geochemical evaluation of the groundwater flow system in the Yucca Flat/Climax Mine Corrective Action Unit (CAU). The main objectives of this study are to identify probable pathways for groundwater flow within the study area and to develop constraints on groundwater transit times...
Michael P. Poland, Andrew V. Newman, editor(s)
2006, Journal of Volcanology and Geothermal Research (150)
The 18 papers herein report on new geodetic data that offer valuable insights into eruptive activity and magma transport; they present new models and modeling strategies that have the potential to greatly increase understanding of magmatic, hydrothermal, and volcano-tectonic processes; and they describe innovative techniques for collecting geodetic measurements from remote,...
Michael P. Poland, Michael W. Hamburger, Andrew V. Newman
2006, Journal of Volcanology and Geothermal Research (150) 1-13
At the very heart of volcanology lies the search for the 'plumbing systems' that form the inner workings of Earth’s active volcanoes. By their very nature, however, the magmatic reservoirs and conduits that underlie these active volcanic systems are elusive; mostly they are observable only through circumstantial evidence, using indirect,...
Donald L. DeAngelis, J. Nathaniel Holland
2006, Ecological Modelling (191) 551-556
Prey (N) dependence [g(N)], predator (P) dependence [g(P) or g(N,P)], and ratio dependence [f(P/N)] are often seen as contrasting forms of the predator's functional response describing predator consumption rates on prey resources in predator–prey and parasitoid–host interactions. Analogously, prey-, predator-, and ratio-dependent functional responses are apparently alternative functional responses for other...
Michelle Sneed, Tracy Nishikawa, Peter Martin
2006, Fact Sheet 2005-3112
Edwards Air Force Base (EAFB) in southern California (fig. 1) has relied on ground water to meet its water-supply needs. The extraction of ground water has led to two major problems that can directly affect the mission of EAFB: declining water levels (more than 120 ft since the 1920s) and...
Paul E. Stackelberg, Edward T. Furlong, Michael T. Meyer, Steven D. Zaugg, Alden K. Henderson, Dori B. Reissman
2006, Science of the Total Environment (354) 93-97
The U.S. Geological Survey (USGS) and the Centers for Disease Control thank Dr. Till for her comments concerning our research (Till, 2005) and welcome the opportunity to respond. The primary objective of our study was to evaluate the potential for organic wastewater-related contaminants (OWCs), including pharmaceuticals, to survive a...
F. Dominguez-Castro, J.I. Santisteban, R. Mediavilla, Walter E. Dean, Enrique Lopez-Pamo, Maria Blanca Ruiz-Zapata, Maria Jose Gil-Garcia
2006, Boletin Geologico y Minero (117) 537-544
Las Tablas de Daimiel National Park has suffered too many modifications throughout its history, natural as well as anthropic, which have affected the carbon storage in different ways. The study of those variations has been carried out by the analysis of sedimentary record and historical data. The sedimentary record has...
Jordon Bright, Darrell Kaufman, Richard Forester, Walter E. Dean
2006, Quaternary Science Reviews (25) 2258-2270
Oxygen and carbon isotopes from a continuous, 120-m-long, carbonate-rich core from Bear Lake, Utah-Idaho, document dramatic fluctuations in the hydrologic budget of the lake over the last 250,000 yr. Isotopic analyses of bulk sediment samples capture millennial-scale variability. Ostracode calcite was analyzed from 78...
Peter J. Barrett, F. Florindo, Alan K. Cooper
2006, Palaeogeography, Palaeoclimatology, Palaeoecology (231) 1-8
This special issue on “Antarctic Climate Evolution—view from the margin” presents results from modelling studies and reports on geoscience data aimed at improving our understanding of the behaviour of the Antarctic ice sheet and the climate of the region. This research field is of interest because of the sensitivity of...
Allison T. Faris, Raymond B. Seed, Robert E. Kayen, Jiaer Wu
2006, Conference Paper, Proceedings of the 8th U.S. National Conference on Earthquake Engineering
During the 1906 San Francisco Earthquake, liquefaction-induced lateral spreading and resultant ground displacements damaged bridges, buried utilities, and lifelines, conventional structures, and other developed works. This paper presents an improved engineering tool for the prediction of maximum displacement due to liquefaction-induced lateral spreading. A semi-empirical approach is employed, combining mechanistic...
Louis J. Gross, Donald L. DeAngelis
J. Michael Scott, Patricia J. Heglund, Michael L. Morrison, editor(s)
2006, Book chapter, Predicting Species Occurences: Issues of Accuracy and Scale
The Everglades region of South Florida presents one of the major natural system management challenges facing the United States. With its assortment of alligators, crocodiles, manatees, panthers, large mixed flocks of wading birds, highly diverse subtropical flora, and sea of sawgrass, the ecosystem is unique in this country (Davis...
Amy E. Draut, Peter D. Clift
2006, Journal of Sedimentary Research (76) 493-514
Sediment deposited around oceanic volcanic ares potentially provides the most complete record of the tectonic and geochemical evolution of active margins. The use of such tectonic and geochemical records requires an accurate understanding of sedimentary dynamics in an arc setting: processes of deposition and reworking that affect the degree to...
C.H. Key
2006, Fire Ecology (2) 178-203
Ecological definition and detection of fire severity are influenced by factors of spatial resolution and timing. Resolution determines the aggregation of effects within a sampling unit or pixel (alpha variation), hence limiting the discernible ecological responses, and controlling the spatial patchiness of responses distributed throughout a burn (beta variation). As...
James Flocks
2006, Gulf Coast Association of Geological Societies Transactions (56) 195-203
Scientific knowledge from the past century is commonly represented by two-dimensional figures and graphs, as presented in manuscripts and maps. Using today's computer technology, this information can be extracted and projected into three- and four-dimensional perspectives. Computer models can be applied to datasets to provide additional insight into complex spatial...
John Brook, Kimberly Yates, Robert Halley
2006, Book chapter, Remote sensing of aquatic coastal ecosystem processes: Remote sensing and digital image processing
Worldwide, local-scale anthropogenic stress combined with global climate change is driving shifts in the state of reef benthic communities from coral-rich to micro- or macroalgal-dominated (Knowlton, 1992; Done, 1999). Such phase shifts in reef benthic communities may be either abrupt or gradual, and case studies from diverse ocean basins demonstrate...
R. E. Arvidson, S. W. Squyres, R. C. Anderson, J. F. Bell, D. Blaney, J. Bruckner, N.A. Cabrol, W. M. Calvin, M. H. Carr, P. R. Christensen, B. C. Clark, L. Crumpler, D. J. Des Marais, P.A. De Souza Jr., C. D'Uston, T. Economou, J. Farmer, W. H. Farrand, W. Folkner, M. Golombek, S. Gorevan, J. A. Grant, R. Greeley, J. Grotzinger, E. Guinness, B.C. Hahn, L. Haskin, Kenneth E. Herkenhoff, J.A. Hurowitz, S. Hviid, J. R. Johnson, G. Klingelhoefer, A. H. Knoll, G. Landis, C. Leff, M. Lemmon, R. Li, M.B. Madsen, M.C. Malin, S. M. McLennan, H.Y. McSween, D. W. Ming, J. Moersch, R.V. Morris, T. Parker, J. W. Rice Jr., L. Richter, R. Rieder, D.S. Rodionov, C. Schroder, M. Sims, M. Smith, P. Smith, Laurence A. Soderblom, R. Sullivan, S.D. Thompson, N.J. Tosca, A. Wang, H. Wänke, J. Ward, T. Wdowiak, M. Wolff, A. Yen
2006, Journal of Geophysical Research E: Planets (111)
Spirit landed on the floor of Gusev Crater and conducted initial operations on soil‐covered, rock‐strewn cratered plains underlain by olivine‐bearing basalts. Plains surface rocks are covered by wind‐blown dust and show evidence for surface enrichment of soluble species as vein and void‐filling materials and coatings. The surface enrichment is the...
Jim Constantz, Grace W. Su, Christine Hatch
2006, Book chapter, Riverbank filtration hydrology
Temperature is routinely collected as a water quality parameter, but only recently utilized as an environmental tracer of stream exchanges with ground water (Stonestrom and Constantz, 2003). In this paper, water levels and seasonal temperatures were used to estimate streambed hydraulic conductivities and water fluxes. Temperatures and water levels...
Michael J. Rymer, Stephen H. Hickman, Philip W. Stoffer
Carol S. Prentice, Judith G. Scotchmoor, Eldridge M. Moores, Jon P. Kiland, editor(s)
2006, Book chapter, 1906 San Francisco earthquake centennial field guides: Field trips associated with the 100th Anniversary Conference, 18–23 April 2006, San Francisco, California
This field trip is along the central section of the San Andreas fault and consists of eight stops that illustrate surface evidence of faulting, in general, and features associated with active fault creep, in particular. Fault creep is slippage along a fault that occurs either in association with small-magnitude earthquakes...
P. Cook, L.N. Plummer, D. K. Solomon, Eurybiades Busenberg, L. F Han
2006, Book chapter, Chlorofluorocarbons in hydrology: A guidebook
No abstract available. ...
Kazutoshi Imanishi, William L. Ellsworth
Rachel E. Abercrombie, Art McGarr, Giulio Di Toro, Hiroo Kanamori, editor(s)
2006, Book chapter, Earthquakes: Radiated energy and the physics of faulting
Weestimate thesourceparametersof34microearthquakes at Parkfield,CA,ranginginsizefromM-0.2 toM2.1, byanalyzingseismogramsrecorded bythe32-level, 3-componentseismic arrayinstalled in theSAFODPilotHole. Wesucceeded in obtainingstablespectral ratios by stacking theratioscalculatedfromthemovingwindowstakenalongtherecordfollowingthedirectwaves.Thesespectral ratios were modeledtodetermine seismicmoments andcornerfrequenciesassuming an omega-squared model. Static stress dropsand apparent stresses ofmicroearthquakes at Parkfielddisplay moment-independent scaling in agreementwith scaling lawsreported for moderate and large earthquakes. It is likely that thedynamics...
Leonard F. Konikow, Thomas E. Reilly, Paul M. Barlow, Clifford I. Voss
J.W. Delleur, editor(s)
2006, Book chapter, The handbook of groundwater engineering
No abstract available....
D. K. Solomon, L.N. Plummer, Eurybiades Busenberg, P.G. Cook
2006, Book chapter, Use of chlorofluorocarbons in hydrology: guidebook
No abstract available. ...
Charles C. Schwartz, Mark A. Haroldson, Gary C. White, Richard B. Harris, Steve Cherry, Kim A. Keating, Dave Moody, Christopher Servheen
2006, Book
During the past 2 decades, the grizzly bear (Ursus arctos) population in the Greater Yellowstone Ecosystem (GYE) has increased in numbers and expanded in range. Understanding temporal, environmental, and spatial variables responsible for this change is useful in evaluating what likely influenced grizzly bear demographics in the GYE and where...
J.L. Hardebeck, A.J. Michael
2006, Journal of Geophysical Research B: Solid Earth (111)
We present a new focal mechanism stress inversion technique to produce regional-scale models of stress orientation containing the minimum complexity necessary to fit the data. Current practice is to divide a region into small subareas and to independently fit a stress tensor to the focal mechanisms of each subarea. This...