Conference Papers
Science Quality and Integrity
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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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Tectono-magmatic evolution and distribution of porphyry Cu systems in the Central Tethys Region of Turkey, the Caucasus, Iran, and southern Pakistan
Recent compilation of geodynamic, geochemical, geochronologic, and ore deposits data provided an opportunity to review the continental margin, intra-oceanic, and post-collisional tectonic settings in the Central Tethys Region. These settings formed during sequential rifting of microcontinents from the passive margin of Gondwana, their northward transport across the Neo-Tethys Ocean, and their coll
Authors
Lukas Zürcher, Arthur A. Bookstrom, Jane M. Hammarstrom, John C. Mars, Stephen Ludington, Michael L. Zientek, Pamela Dunlap, John C. Wallis
A computational- And storage-cloud for integration of biodiversity collections
A core mission of the Integrated Digitized Biocollections (iDigBio) project is the building and deployment of a cloud computing environment customized to support the digitization workflow and integration of data from all U.S. nonfederal biocollections. iDigBio chose to use cloud computing technologies to deliver a cyberinfrastructure that is flexible, agile, resilient, and scalable to meet the nee
Authors
A. Matsunaga, A. Thompson, R. J. Figueiredo, C.C Germain-Aubrey, M. Collins, R.S Beeman, B.J. Macfadden, G. Riccardi, P.S Soltis, L. M. Page, J.A.B Fortes
Variability and trends in irrigated and non-irrigated croplands in the central U.S
Over 23 million hectares (233 thousand km2) of U.S. croplands are irrigated and there was an overall net expansion of 522 thousand hectares nationally from 2002 to 2007. Most of this expansion occurred across the High Plains Aquifer (HPA) in the central Great Plains. Until recently, there has been a lack of geospatially-detailed irrigation data that are consistent, timely, geographically extensive
Authors
Jesslyn F. Brown, Md Shahriar Pervez
Tsunami flooding
Panel 5 focused on tsunami flooding with an emphasis on Probabilistic Tsunami Hazard
Analysis (PTHA) as derived from its counterpart, Probabilistic Seismic Hazard Analysis (PSHA)
that determines seismic ground-motion hazards. The Panel reviewed current practices in PTHA
and determined the viability of extending the analysis to extreme design probabilities (i.e., 10-4
to 10-6). In addition to e
Authors
Eric Geist, Henry Jones, Mark McBride, Randy Fedors
The SAFRR Tsunami Scenario
The U.S. Geological Survey and several partners operate a program called Science Application for Risk Reduction (SAFRR) that produces (among other things) emergency planning scenarios for natural disasters. The scenarios show how science can be used to enhance community resiliency. The SAFRR Tsunami Scenario describes potential impacts of a hypothetical, but realistic, tsunami affecting California
Authors
K. Porter, Lucile M. Jones, Stephanie L. Ross, J. Borrero, J. Bwarie, D. Dykstra, Eric L. Geist, L. Johnson, Stephen H. Kirby, K. Long, P. Lynett, K. Miller, Carl E. Mortensen, S. Perry, G. Plumlee, C. Real, L. Ritchie, C. Scawthorn, H.K. Thio, Anne Wein, P. Whitmore, R. Wilson, Nathan J. Wood
Mines, mountains and hot springs: IMWA 2013 post-conference tour to Silverton, CO, August 10-13, 2013
An itinerary, maps, and details about the IMWA 2013 post-conference tour from Golden, Colorado to Silverton, Colorado on August 10-13, 2013, are provided.
Authors
Raymond H. Johnson
IMWA 2013 mid-conference tour to Leadville, Colorado, August 7th, 2013
An itinerary, maps, and details about the IMWA 2013 mid-conference tour from Golden, Colorado to Leadville, Colorado on August 7, 2013, are provided.
Authors
Raymond H. Johnson
Application of uniaxial confining-core clamp with hydrous pyrolysis in petrophysical and geochemical studies of source rocks at various thermal maturities
Understanding changes in petrophysical and geochemical parameters during source rock thermal maturation is a critical component in evaluating source-rock petroleum accumulations. Natural core data are preferred, but obtaining cores that represent the same facies of a source rock at different thermal maturities is seldom possible. An alternative approach is to induce thermal maturity changes by lab
Authors
Michael D. Lewan, Justin E. Birdwell
Changes in porosity and organic matter phase distribution monitored by NMR relaxometry following hydrous pyrolysis under uniaxial confinement
Artificial maturation methods are used to induce changes in source rock thermal maturity without the uncertainties that arise when comparing natural samples from a particular basin that often represent different levels of maturation and different lithofacies. A novel uniaxial confinement clamp was used on Woodford Shale cores in hydrous pyrolysis experiments to limit sample expansion by simulating
Authors
Kathryn E. Washburn, Justin E. Birdwell, Michael D. Lewan, Michael Miller
A new laboratory approach to shale analysis using NMR relaxometry
Low-field nuclear magnetic resonance (LF-NMR) relaxometry is a non-invasive technique commonly used to assess hydrogen-bearing fluids in petroleum reservoir rocks. Measurements made using LF-NMR provide information on rock porosity, pore-size distributions, and in some cases, fluid types and saturations (Timur, 1967; Kenyon et al., 1986; Straley et al., 1994; Brown, 2001; Jackson, 2001; Kleinberg,
Authors
Kathryn E. Washburn, Justin E. Birdwell
Characterizing tight-gas systems with production data: Wyoming, Utah, and Colorado
The study of produced fluids allows comparisons among tight-gas systems. This paper examines gas, oil, and water production data from vertical wells in 23 fields in five Rocky Mountain basins of the United States, mostly from wells completed before the year 2000. Average daily rates of gas, oil, and water production are determined two years and seven years after production begins in order to repre
Authors
Philip H. Nelson, Stephen L. Santus
Low salinity hydrocarbon water disposal through deep subsurface drip irrigation: leaching of native selenium
A subsurface drip irrigation system is being used in Wyoming’s Powder River Basin that treats high sodium, low salinity, coal bed methane (CBM) produced water with sulfuric acid and injects it into cropped fields at a depth of 0.92 m. Dissolution of native gypsum releases calcium that combats soil degradation that would otherwise result from high sodium water. Native selenium is leached from soil
Authors
Carleton R. Bern, Mark A. Engle, Adam R. Boehlke, John W. Zupancic