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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Geomagnetic referencing in the arctic environment
Geomagnetic referencing is becoming an increasingly attractive alternative to north-seeking gyroscopic surveys to achieve the precise wellbore positioning essential for success in today's complex drilling programs. However, the greater magnitude of variations in the geomagnetic environment at higher latitudes makes the application of geomagnetic referencing in those areas more challenging. Precise
Authors
Benny Podjono, Nathan Beck, Andrew Buchanan, Jason Brink, Joseph Longo, Carol A. Finn, E. William Worthington
Global amphibian declines: perspectives from the United States and beyond
Over recent decades, amphibians have experienced population declines, extirpations and species-level extinctions at an alarming rate. Numerous potential etiologies for amphibian declines have been postulated including climate and habitat degradation. Other potential anthropogenic causes including overexploitation and the frequent introductions of invasive predatory species have also been blamed fo
Authors
Christine L. Densmore
Global patterns of phytoplankton dynamics in coastal ecosystems
Scientific Committee on Ocean Research Working Group 137 Meeting; Hangzhou, China, 17-21 October 2010; Phytoplankton biomass and community structure have undergone dramatic changes in coastal ecosystems over the past several decades in response to climate variability and human disturbance. These changes have short- and long-term impacts on global carbon and nutrient cycling, food web structure and
Authors
H. Paerl, Kedong Yin, J. Cloern, James E. Cloern
Group on Earth Observations (GEO) global drought early warning information service
[No abstract available]
Authors
W. Pozzi, D. Cripe, J. Vogt, M. Werner, R. Heim, M.J. Brewer, J. Sheffield, R. Westerhoff, R. Stefanski, M. Svoboda, J. Verdin
Helicopter magnetic and electromagnetic surveys at Mounts Adams, Baker and Rainier, Washington: implications for debris flow hazards and volcano hydrology
High‐resolution helicopter magnetic and electromagnetic (HEM) data flown over the rugged, ice‐covered Mt. Adams, Mt. Baker and Mt. Rainier volcanoes (Washington), reveal the distribution of alteration, water and ice thickness essential to evaluating volcanic landslide hazards. These data, combined with geological mapping and rock property measurements, indicate the presence of appreciable thicknes
Authors
Carol A. Finn, Maria Deszcz-Pan
Infectious diseases: Surveillance, genetic modification and simulation
Infectious diseases such as influenza and dengue have the potential of becoming a worldwide pandemic that may exert immense pressures on existing medical infrastructures. Careful surveillance of these diseases, supported by consistent model simulations, provides a means for tracking the disease evolution. The integrated surveillance and simulation program is essential in devising effective early w
Authors
H. L. Koh, S.Y. Teh, D. L. De Angelis, J. Jiang
Intercontinental gene flow among western arctic populations of lesser snow geese
Quantifying the spatial genetic structure of highly vagile species of birds is important in predicting their degree of population demographic and genetic independence during changing environmental conditions, and in assessing their abundance and distribution. In the western Arctic, Lesser Snow Geese (Chen caerulescens caerulescens) provide an example useful for evaluating spatial population geneti
Authors
Rainy I. Shorey, K.T. Scribner, Jeannette Kanefsky, M. D. Samuel, S.V. Libants
Key science issues in the central and eastern United States for the next version of the USGS National Seismic Hazard Maps
The USGS National Seismic Hazard Maps are updated about every six years by incorporating newly vetted science on earthquakes and ground motions. The 2008 hazard maps for the central and eastern United States region (CEUS) were updated by using revised New Madrid and Charleston source models, an updated seismicity catalog and an estimate of magnitude uncertainties, a distribution of maximum magnitu
Authors
M.D. Peterson, C.S. Mueller
Landscape evolution in south-central Minnesota and the role of geomorphic history on modern erosional processes
The Minnesota River Valley was carved during catastrophic drainage of glacial Lake Agassiz at the end of the late Pleistocene. The ensuing base-level drop on tributaries created knickpoints that excavated deep valleys as they migrated upstream. A sediment budget compiled in one of these tributaries, the Le Sueur River, shows that these deep valleys are now the primary source of sediment to the Min
Authors
K.B. Gran, P. Belmont, S.S. Day, N. Finnegan, C. Jennings, J.W. Lauer, P.R. Wilcock
Long-term observations of Boreal Toads at an ARMI apex site
The U.S. Geological Survey’s Amphibian Research and Monitoring Initiative (ARMI) is a national project with goals to monitor the status and trends of amphibians, conduct research on causes of declines, and provide information and support to management agencies for conservation of amphibian populations. ARMI activities are organized around extensive inventories and place-based monitoring (such as c
Authors
Paul Stephen Corn, Erin L. Muths, David S. Pilliod
Making United States Integrated Ocean Observing System (U.S. IOOS) inclusive of marine biological resources
An important Data Management and Communication (DMAC) goal is to enable a multi-disciplinary view of the ocean environment by facilitating discovery and integration of data from various sources, projects and scientific domains. United States Integrated Ocean Observing System (U.S. IOOS) DMAC functional requirements are based upon guidelines for standardized data access services, data formats, meta
Authors
H. Moustahfid, J. Potemra, P. Goldstein, R. Mendelssohn, A. Desrochers
Mapping the distribution of materials in hyperspectral data using the USGS Material Identification and Characterization Algorithm (MICA)
Identifying materials by measuring and analyzing their reflectance spectra has been an important method in analytical chemistry for decades. Airborne and space-based imaging spectrometers allow scientists to detect materials and map their distributions across the landscape. With new satellite-borne hyperspectral sensors planned for the future, for example, HYSPIRI (HYPerspectral InfraRed Imager),
Authors
Raymond F. Kokaly, T. V. V. King, Todd M. Hoefen