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.
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Applications of geophysical methods to volcano monitoring
The array of geophysical technologies used in volcano hazards studies - some developed originally only for volcano monitoring - ranges from satellite remote sensing including InSAR to leveling and EDM surveys, campaign and telemetered GPS networks, electronic tiltmeters and strainmeters, airborne magnetic and electromagnetic surveys, short-period and broadband seismic monitoring, even microphones
Authors
Jeff Wynn, Daniel Dzurisin, Carol A. Finn, James P. Kauahikaua, Richard G. Lahusen
Magnetic properties, acid neutralization capacity, and net acid production of rocks in the Animas River Watershed Silverton, Colorado
Federal land managers along with local stakeholders in the Upper Animas River watershed near Silverton, Colorado are actively designing and implementing mine waste remediation projects to mitigate the effects of acid mine drainage from several abandoned hard rock metal mines and mills. Local source rocks with high acid neutralization capacity (ANC) within the watershed are of interest to land mana
Authors
Anne E. McCafferty, Douglas B. Yager, Radley M. Horton, Sharon F. Diehl
Lessons learned from the U.S. Geological Survey abandoned mine lands initiative: 1997-2002
Growth of the United States has been facilitated, in part, by hard-rock mining in the Rocky Mountains. Abandoned and inactive mines cause many significant environmental concerns in hundreds of watersheds. Those who have responsibility to address these environmental concerns must have a basic level of scientific information about mining and mine wastes in a watershed prior to initiating remediation
Authors
Briant A. Kimball, Stan E. Church, John M. Besser
What's weathering? Mineralogy and field leach studies in mine waste, Leadville and Montezuma mining districts, Colorado
Weathering is important in the development of rock fabrics that control porosity in mine-waste materials, and in turn, porosity affects metal transport through and from mine-waste piles into watersheds. Mine-waste piles are dynamic physical and chemical systems as evidenced by remnant Fe-oxide boxwork structures after sulfide minerals, development of alteration rinds and etch pits on grains, and p
Authors
S. F. Diehl, Phil L. Hageman, Kathleen S. Smith
Predicting toxic effects of copper on aquatic biota in mineralized areas by using the Biotic Ligand Model
The chemical speciation of metals influences their biological effects. The Biotic Ligand Model (BLM) is a computational approach to predict chemical speciation and acute toxicological effects of metals on aquatic biota. Recently, the U.S. Environmental Protection Agency incorporated the BLM into their regulatory water-quality criteria for copper. Results from three different laboratory copper toxi
Authors
Kathleen S. Smith, James F. Ranville, M. Adams, LaDonna M. Choate, Stan E. Church, David L. Fey, Richard B. Wanty, James G. Crock
Integrating bioavailability approaches into waste rock evaluations
The presence of toxic metals in soils affected by mining, industry, agriculture and urbanization, presents problems to human health, the establishment and maintenance of plant and animal habitats, and the rehabilitation of affected areas. A key to managing these problems is predicting the fraction of metal in a given soil that will be biologically labile, and potentially harmful ('bioavailable').
Authors
James F. Ranville, E. P. Blumenstein, M. J. Adams, LaDonna M. Choate, Kathleen S. Smith, Thomas R. Wildeman
Impacts on water quality and biota from natural acid rock drainage in Colorado's Lake Creek watershed
Colorado's Lake Creek watershed hosts natural acid rock drainage that significantly impacts surface water, streambed sediment, and aquatic life. The source of the ARD is a group of iron-rich springs that emerge from intensely hydrothermally altered, unexploited, low-grade porphyry copper mineralization in the Grizzly Peak Caldera. Source water chemistry includes pH of 2.5 and dissolved metal conce
Authors
D.A. Bird, Matthew A. Sares, Greg A. Policky, Travis S. Schmidt, Stan E. Church
Remote sensing methods for mapping the onset and progression of spartina alterniflora marsh dieback in coastal Louisiana
No abstract available.
Authors
Amina Rangoonwala, Elijah Ramsey III, Gene Nelson
A semi-empirical model for the estimation of maximum horizontal displacement due to liquefaction-induced lateral spreading
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, comb
Authors
Allison T. Faris, Raymond B. Seed, Robert E. Kayen, Jiaer Wu
Constraining rates and trends of historical wetland loss, Mississippi River Delta Plain, south-central Louisiana
The timing, magnitude, and rate of wetland loss were described for five wetland-loss
hotspots in the Terrebonne Basin of the Mississippi River delta plain. Land and water areas
were mapped for 34 dates between 1956 and 2004 from historical National Wetlands
Inventory (NWI) datasets, aerial photographs, and Landsat Thematic Mapper (TM) satellite
images. Since 1956, the emergent land area at the
Authors
Julie Bernier, Robert A. Morton, John A. Barras
Macroinvertebrate abundance, water chemistry, and wetland characteristics affect use of wetlands by avian species in Maine
Our objective was to determine use by avian species (e.g., piscivores, marsh birds, waterfowl, selected passerines) of 29 wetlands in areas with low ( 5.51. All years combined use of wetlands by broods was greater on wetlands with pH < 5.51 (77.4%) in contrast to wetlands with pH > 5.51 that supported 21.8% of the broods. High mean brood density was associated with mean number of Insecta per wet
Authors
J. R. Longcore, D.G. McAuley, G.W. Pendleton, C. R. Bennatti, T.M. Mingo, K. L. Stromborg
A cool eastern Pacific Ocean at the close of the Last Interglacial complex
New high-precision thermal ionization mass-spectrometric (TIMS) U-series ages of solitary corals (Balanophyllia elegans) from several marine terrace localities along the California and southern Oregon coasts date to the ???80,000 yr BP high stand of sea, correlative with marine isotope substage 5a, late in the last interglacial complex. Ages of multiple corals from localities north of Point An??o
Authors
D.R. Muhs, K. R. Simmons, G. L. Kennedy, K. R. Ludwig, L.T. Groves