Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
Filter Total Items: 5326
Enzyme leaching of surficial geochemical samples for detecting hydromorphic trace-element anomalies associated with precious-metal mineralized bedrock buried beneath glacial overburden in northern Minnesota
One objective of the International Falls and Roseau, Minnesota, CUSMAP projects was to develop a means of conducting regional-scale geochemical surveys in areas where bedrock is buried beneath complex glacially derived overburden. Partial analysis of B-horizon soils offered hope for detecting subtle hydromorphic trace-element dispersion patterns. An enzyme-based partial leach selectively removes m
Authors
Robert J. Clark, A. L. Meier, G. Riddle
Evaluation of sea otter capture after the Exxon Valdez oil spill, Prince William Sound, Alaska
After the T/V Exxon Valdez oil spill into Prince William Sound, the U.S. Fish and Wildlife Service and Exxon Company, U.S.A., began rescuing sea otters (Enhydra lutris). The primary objective of this operation was to capture live, oiled sea otters for cleaning and rehabilitation. Between 30 March and 29 May 1989, 139 live sea otters were captured in the sound and transported to rehabilitation cent
Authors
James L. Bodkin, F. Weltz
Evolution of the Tertiary La Honda basin, central California
Tertiary strata of the La Honda basin are exposed in the Santa Cruz Mountains along the central California coast south of San Francisco. The basin fill has a composite thickness of more than 14,500 m and consists of sedimentary and volcanic rocks that in places rest on granitic basement rocks of the Salinia terrane. Paleogene strata are mainly turbidite sandstone and hemipelagic mudstone that accu
Authors
Richard G. Stanley
Explanatory notes
No abstract available
Authors
P.B. Fryer, J.A. Pearce, L.B. Stokking, J.R. Ali, R.J. Arculus, D.L. Ballotti, M.M. Burke, Giuliano Ciampo, J.A. Haggerty, R.B. Haston, Dietrich Heling, M.A. Hobart, Teruaki Ishii, L.E. Johnson, Yves Lagabrielle, F.W. McCoy, Hirokazu Maekawa, M. S. Marlow, G.J. Milner, M.J. Mottl, B.J. Murton, S.P. Phipps, C.A. Rigsby, K.L. Saboda, Bjorg Stabell, S.R. Van der Laan, Yulin Xu
Geographic information system as country-level development and monitoring tool, Senegal example
Geographic information systems (GIS) allow an investigator the capability to merge and analyze numerous types of country-level resource data. Hypothetical resource analysis applications in Senegal were conducted to illustrate the utility of a GIS for development planning and resource monitoring. Map and attribute data for soils, vegetation, population, infrastructure, and administrative units were
Authors
Donald G. Moore, Stephen M. Howard
Geohydrology of the near-surface unsaturated zone adjacent to the disposal site for low-level radioactive waste near Beatty, Nevada: A section in Safe disposal of radionuclides in low-level radioactive-waste repository sites; Low-level radioactive-waste d
Shallow-land burial in arid areas is considered the best method for isolating low-level radioactive waste from the environment (Nichols and Goode, this report; Mercer and others, 1983). A major threat to waste isolation in shallow trenches is ground-water percolation. Repository sites in arid areas are believed to minimize the risk of ground-water contamination because such sites receive minimal p
Authors
Jeffrey M. Fisher
Geologic map and geothermal assessment of the Mount Adams volcanic field, Cascade Range of southern Washington
More than 60 Quaternary vents make up the basalt-to-rhyodacite Mount Adams volcanic field and have erupted scoriae and lavas with a total volume of >370 km3. The Mount Adams andesite-dacite stratocone itself is a compound edifice that includes the high cone above 2300 m (20-10 ka), remnants of at least two earlier andesite-dacite cones as old as 0.5 Ma, and 7 Holocene flank vents. Four other Holoc
Authors
Wes Hildreth, Judy Fierstein
Geologic map of Mount Mazama, Crater Lake, Oregon
Crater Lake caldera collapsed about 6,850 yr B.P. during the climactic eruption of Mount Mazama, a High Cascade basaltic andesitic to dacitic volcanic center that was constructed during a period of about 400,000 yr. The caldera and the products of the climactic eruption are clear evidence for the presence of a shallow magma body that must have supported a hydrothermal system in the recent past. Th
Authors
Charles Bacon
By
Geologic map of the Lassen region, Cascade Range, USA
A preliminary geologic map at 1:50,000 of the Lassen region encompasses 1400 km2. The map displays many small, monogenetic volcanoes of basalt to andesite as well as three major late Pliocene and Quaternary volcanic centers that have erupted products ranging from basaltic andesite to rhyolite. The youngest of these volcanic centers is the Lassen volcanic center, active from 600,000 years B.P. to t
Authors
Michael Clynne, L.J. Muffler
Geology of Medicine Lake Volcano, Northern California Cascade Range
Medicine Lake volcano (MLV) is located in an E-W extensional environment on the Modoc Plateau just east of the main arc of the Cascades. It consists mainly of mafic lavas, although drillhole data indicate that a larger volume of rhyolite is present than is indicated by surface mapping. The most recent eruption was rhyolitic and occurred about 900 years ago. At least seventeen eruptions have occurr
Authors
Julie Donnelly-Nolan
Geotechnical engineering for ocean waste disposal. An introduction
As members of multidisciplinary teams, geotechnical engineers apply quantitative knowledge about the behavior of earth materials toward designing systems for disposing of wastes in the oceans and monitoring waste disposal sites. In dredge material disposal, geotechnical engineers assist in selecting disposal equipment, predict stable characteristics of dredge mounds, design mound caps, and predict
Authors
Homa J. Lee, Kenneth R. Demars, Ronald C. Chaney
Geothermal segmentation of the Cascade Range in the USA
Characteristics of the crustal thermal regime of the Quaternary Cascades vary systematically along the range. Spatially congruent changes in volcanic vent distribution, volcanic extrusion rate, hydrothermal discharge rate, and regional conductive heat flow define 5 geothermal segments. These segments are, from north to south: (1) the Washington Cascades north of Mount Rainier, (2) the Cascades fro
Authors
Marianne Guffanti, L.J. Muffler, Robert H. Mariner, D. R. Sherrod, James G. Smith, D.D. Blackwell, C. S. Weaver