R. C. Orndorff, R.W. Harrison, D. J. Weary
2000, IMAP 2653
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Page 3193, results 79801 - 79825
Publication Extents
Not all publications have extents, not all extents are completely accurateLisa R. Gaddis, Bernard Ray Hawke, Mark S. Robinson, Cassandra Coombs
2000, Journal of Geophysical Research E: Planets (105) 4245-4262
Clementine ultraviolet-visible (UVVIS) data are used to examine the compositions of 18 pyroclastic deposits (15 small, three large) at 13 sites on the Moon. Compositional variations among pyroclastic deposits largely result from differing amounts of new basaltic (or juvenile) material and reworked local material entrained in their ejecta upon eruption....
J. K. Aggarwal, M. R. Palmer, Thomas D. Bullen, S. Arnorsson, K. V. Ragnarsdottir
2000, Geochimica et Cosmochimica Acta (64) 579-585
We have measured the boron isotope composition and boron and chloride concentrations of 27 Icelandic geothermal fluids from both high- and low-temperature systems. The δ11B values range from −6.7‰ in the Krafla system, to +25.0‰ in a warm spring from the Southern Lowlands. In addition, we have also determined the...
Arthur C. Medeiros, Charles G. Chimera, Lloyd L. Loope, Stephanie M. Joe, Paul D. Krushelnycky
2000, Pacific Science (54) 517-522
The annual, endemic, coastal herb Centaurium sebaeoides is the only native Hawaiian species in the gentian family. The U.S. Fish and Wildlife Service listed it as Endangered under the Endangered Species Act on 29 October 1991. Before surveys reported here, the total population of this species statewide was estimated at...
J.F. Bell III, H.Y. McSween Jr., J.A. Crisp, R.V. Morris, S.L. Murchie, N.T. Bridges, J. R. Johnson, D.T. Britt, M.P. Golombek, H. J. Moore, A. Ghosh, J.L. Bishop, R. C. Anderson, J. Bruckner, T. Economou, J.P. Greenwood, H.P. Gunnlaugsson, R.M. Hargraves, S. Hviid, J. M. Knudsen, M.B. Madsen, R. Reid, R. Rieder, L. Soderblom
2000, Journal of Geophysical Research E: Planets (105) 1721-1755
Mars Pathfinder obtained multispectral, elemental, magnetic, and physical measurements of soil and dust at the Sagan Memorial Station during the course of its 83 sol mission. We describe initial results from these measurements, concentrating on multispectral and elemental data, and use these data, along with previous Viking, SNC meteorite, and...
Scott B. Miles, David K. Keefer
2000, Environmental and Engineering Geoscience (6) 25-39
This paper compares four permanent displacement models based on Newmark's sliding-block analogy for assessing regional seismic slope-performance. The models vary primarily by the ground motion descriptor used to correlate with Newmark displacement. The first uses peak ground-acceleration (PGA). The second uses PGA but normalizes displacements by predominant period and equivalent...
Kurt H. Riitters, James D. Wickham, James Vogelmann, K. Bruce Jones
2000, Ecology (81) 604
Land cover and its spatial patterns are key ingredients in ecological studies that consider large regions and the impacts of human activities. Because land-cover maps show only cover types and their locations, further processing is needed to extract pattern information and to characterize its spatial variability. We are producing a...
Roger D. Borcherdt
2000, Earthquake Spectra (16) 309-310
No abstract available....
R. E. Rathbun
2000, Critical Reviews in Environmental Science and Technology (30) 129-295
Volatile organic compounds (VOCs) are compounds with chemical and physical properties that allow the compounds to move freely between the water and air phases of the environment. VOCs are widespread in the environment because of this mobility. Many VOCs have properties that make them suspected or known hazards to the...
Thomas O. Mesko, Lindsay A. Swain, E. F. Hollyday
2000, Hydrologic Atlas 732-B
Severe and prolonged droughts between 1961 and 1988, combined with increased demands for freshwater supplies in the United States, have resulted in a critical need to assess the potential for development of ground- and surface-water supplies. Rapid industrial growth and urban expansion have caused existing freshwater supplies to be used...
O.L. Snoeyenbos-West, K.P. Nevin, R. T. Anderson, D.R. Lovely
2000, Microbial Ecology (39) 153-167
Engineered stimulation of Fe(III) has been proposed as a strategy to enhance the immobilization of radioactive and toxic metals in metal-contaminated subsurface environments. Therefore, laboratory and field studies were conducted to determine which microbial populations would respond to stimulation of Fe(III) reduction in the sediments of sandy aquifers. In laboratory...
Water Resources Division, U.S. Geological Survey
2000, Circular 1193
This report documents implications for earthquake risk reduction in the U.S. The magnitude 7.4 earthquake caused 17,127 deaths, 43,953 injuries, and displaced more than 250,000 people from their homes. The report warns that similar disasters are possible in the United States where earthquakes of comparable size strike the heart of...
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 181-99
Leslie A. Dillard, Martin J. Blunt
2000, Water Resources Research (36) 439-454
A pore network simulation model was developed to investigate the fundamental physics of nonequilibrium nonaqueous phase liquid (NAPL) dissolution. The network model is a lattice of cubic chambers and rectangular tubes that represent pore bodies and pore throats, respectively. Experimental data obtained by Powers [1992] were used to develop and validate the...
Frances D. Hostettler, Robert J. Rosenbauer, Keith A. Kvenvolden
2000, Organic Geochemistry (31) 939-943
No abstract available....
Terry L. Sohl, Thomas Loveland, Kristi Sayler, Alisa L. Gallant, Roger F. Auch, Darrell E. Napton
T.I. Stein, editor(s)
2000, Conference Paper, EEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings
Policy-makers and scientists often require comprehensive data on the types and rates of land use and land cover change at a variety of scales. However, there is generally a lack of local, regional, and national land use and land cover data of sufficient reliability and temporal and geographic detail for...
E. Proffitt
2000, ERF Newsletter (26) 7-25
No abstract available....
Matthew C. Larsen
2000, Physical Geography (21) 494-521
During the period from 1990 to 1997, annual rainfall accumulation averaged 87% of normal at the 12 stations with the longest period of record in Puerto Rico, a Caribbean island with a 1999 population of 3.8 million. Streamflow in rivers supplying the La Plata and Loíza reservoirs, the principal water...
D. Clague, James G. Moore, J.R. Reynolds
2000, Bulletin of Volcanology (62) 214-233
High-resolution bathymetric mapping has shown that submarine flat-topped volcanic cones, morphologically similar to ones on the deep sea floor and near mid-ocean ridges, are common on or near submarine rift zones of Kilauea, Kohala (or Mauna Kea), Mahukona, and Haleakala volcanoes. Four flat-topped cones on Kohala were explored and sampled...
S. Circone, Laura A. Stern, Stephen H. Kirby, J.C. Pinkston, William B. Durham
2000, Annals of the New York Academy of Sciences (912) 544-555
We performed rapid depressurization experiments on methane hydrate under isothermal conditions above 272 K to determine the amount and rate of methane evolution. Sample temperatures rapidly drop below 273 K and stabilize near 272.5 K during dissociation. This thermal anomaly and the persistence of methane hydrate are consistent with the...
Stephen H. Kirby
2000, Nature (403) 31-34
No abstract available....
Ryan M. Troyer, Scott E. LaPatra, Gael Kurath
2000, Journal of General Virology (81) 2823-2832
Infectious haematopoietic necrosis virus (IHNV) is the most significant virus pathogen of salmon and trout in North America. Previous studies have shown relatively low genetic diversity of IHNV within large geographical regions. In this study, the genetic heterogeneity of 84 IHNV isolates sampled from rainbow trout (Oncorhynchus mykiss) over...
E. A. Bailey, D. B. Smith, C. C. Abston, Matthew Granitto, K. A. Burleigh
2000, Open-File Report 99-433
This dataset contains geochemical data for Alaska produced by the analytical laboratories of the Geologic Division of the U.S. Geological Survey (USGS). These data represent analyses of stream-sediment, heavy-mineral-concentrate (derived from stream sediment), soil, and organic material samples. Most of the data comes from mineral resource investigations conducted in the...
P. E. O’Brien, Alan K. Cooper, Carl Richter, M Macphail, E.M. Truswell
2000, JOIDES Journal (26) 4-10
The Antarctic Ice Sheet is one of the great features of our planet. It plays a pivotal role in global atmospheric circulation and the sea-ice zone around it produces cold waters that control much of the ocean’s deep circulation. The Antarctic Ice Sheet is also the largest store of fresh...
C. Escutia, S. L. Eittreim, Alan K. Cooper, C.H. Nelson
2000, Journal of Sedimentary Research (70) 84-93
The Wilkes Land continental slope contains an intricate network of submarine canyons that on the continental rise develop into a series of channel and overbank deposits of turbidite systems. We can define upper-fan, middle-fan, and lower-fan provinces. The Wilkes Land upper fans are characterized by large channels with relief up...