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Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 6158
Aggregation: Physical aspects Aggregation: Physical aspects
No abstract available.
Authors
John R. Nimmo
Effects of benthic fauna on arsenic transport in Whitewood Creek, South Dakota Effects of benthic fauna on arsenic transport in Whitewood Creek, South Dakota
Field measurements and bioassay experiments were done to investigate the effects of arsenic and phosphorus interactions on sorption of these solutes by the benthic flora (periphyton and submerged macrophytes) in Whitewood Creek, a stream in western South Dakota. Short-term (24-hour) sorption experiments were used to determine arsenic transport characteristics for algae (first-order rate...
Authors
James S. Kuwabara, C.C.Y. Chang, S.P. Pasilis
Seismic history of the Middle America subduction zone along El Salvador, Guatemala, and Chiapas, Mexico: 1526–2000 Seismic history of the Middle America subduction zone along El Salvador, Guatemala, and Chiapas, Mexico: 1526–2000
We present a catalog of subduction zone earthquakes along the Pacific coast from central El Salvador to eastern Chiapas, Mexico, from 1526 to 2000. We estimate that the catalog is complete since 1690 for MS ≥7.4 thrust events and M ≥ 7.4 normal-faulting events within the upper 60 km of the down-going slab. New intensity maps were constructed for the 27 earthquakes since 1690, using...
Authors
Randall A. White, Juan Pablo Ligorria, I.L. Cifuentes
Porosity and pore-size distribution Porosity and pore-size distribution
No abstract available.
Authors
John R. Nimmo
Using geochemical data and aquifer simulation to characterize recharge and groundwater flow in the Middle Rio Grande Basin, New Mexico Using geochemical data and aquifer simulation to characterize recharge and groundwater flow in the Middle Rio Grande Basin, New Mexico
No abstract available.
Authors
Niel Plummer, Ward E. Sanford, Laura M. Bexfield, Scott K. Anderholm, Eurybiades Busenberg
Selenium loading through the Blackfoot River watershed--linking sources to ecosystem Selenium loading through the Blackfoot River watershed--linking sources to ecosystem
The upper Blackfoot River watershed in southeast Idaho receives drainage from 11 of 16 phosphate mines that have extracted ore from the Phosphoria Formation, three of which are presently active. Toxic effects from selenium (Se), including death of livestock and deformity in aquatic birds, were documented locally in areas where phosphatic shales are exposed (Piper et al., 2000; Presser et...
Authors
Theresa S. Presser, Matthew Hardy, Mark Huebner, Paul J. Lamothe
Fundamental concepts of recharge in the Desert Southwest: A regional modeling perspective Fundamental concepts of recharge in the Desert Southwest: A regional modeling perspective
Recharge in arid basins does not occur in all years or at all locations within a basin. In the desert Southwest potential evapotranspiration exceeds precipitation on an average annual basis and, in many basins, on an average monthly basis. Ground-water traveltime from the surface to the water table and recharge to the water table vary temporally and spatially owing to variations in...
Authors
Alan L. Flint, Lorraine E. Flint, J.A. Hevesi
Seismicity and tectonics of El Salvador Seismicity and tectonics of El Salvador
The large-scale plate-tectonics framework of El Salvador was defined in the “plate-tectonics revolution” of the 1960s and 1970s, but important issues related to seismic hazards depend on details that have been only recently, or are not yet, understood. Present evidence suggests that coupling across the interface-thrust zone beneath coastal El Salvador is sufficient to produce occasional...
Authors
James W. Dewey, Randall A. White, Douglas A. Hernandez
Age and evolution of the Precambrian crust of the Tobacco Root Mountains, Montana Age and evolution of the Precambrian crust of the Tobacco Root Mountains, Montana
U-Pb analyses of zircons from gneisses, anatectic leucosome, metasedimentary rocks, and a younger (metamorphosed) mafic dike from the Tobacco Root Mountains of southwestern Montana document a Precambrian history that extends from at least 3.90–1.77 Ga. The oldest U-Pb age reported here (3.8 Ga) is from a detrital zircon from a quartzite within the Spuhler Peak Metamorphic Suite, although...
Authors
Paul A. Mueller, Henry Robert Burger, Joseph L. Wooden, Ann L. Heatherington, David W. Mogk, Kimberly D’Arcy
Geochemistry of quartzofeldspathic gneisses and metamorphic mafic rocks of the Indian Creek and Pony–Middle Mountain Metamorphic Suites, Tobacco Root Mountains, Montana Geochemistry of quartzofeldspathic gneisses and metamorphic mafic rocks of the Indian Creek and Pony–Middle Mountain Metamorphic Suites, Tobacco Root Mountains, Montana
Quartzofeldspathic gneisses and metamorphic mafic rocks are the dominant lithologies in the Indian Creek and Pony–Middle Mountain Metamorphic Suites of the Tobacco Root Mountains. Field relations, geochemical discriminant analysis, and isotopic systematics indicate that these rocks derive from a bimodal volcanic suite ca. 3.3 Ga. The quartzofeldspathic gneisses contain sodic rocks of the...
Authors
David W. Mogk, Henry Robert Burger, Paul A. Mueller, Kimberly D’Arcy, Ann L. Heatherington, Joseph L. Wooden, Reyna L. Abeyta, Jennifer L. Martin, Lisa J. Jacob
American White Pelican (Pelecanus erythrorhynchos) American White Pelican (Pelecanus erythrorhynchos)
No abstract available.
Authors
F.L. Knopf
Appendix II. Formulae for selected materials used to isolate and study fungi and fungal allies Appendix II. Formulae for selected materials used to isolate and study fungi and fungal allies
No abstract available.
Authors
G.F. Bills, M.S. Foster