Conference Papers
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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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Prey consumption and energy transfer by marine birds in the Gulf of Alaska
We investigated prey consumption by marine birds and their contribution to cross-shelf fluxes in the northern Gulf of Alaska. We utilized data from the North Pacific Pelagic Seabird Database for modeling energy demand and prey consumption. We found that prey consumption by marine birds was much greater over the continental shelf than it was over the basin. Over the shelf, subsurface-foraging marin
Authors
G.L. Hunt, G.S. Drew, J. Jahncke, John F. Piatt
Primary production in an impounded baldcypress swamp (Taxodium distichum) at the northern limit of the range
The ability of baldcypress (Taxodium distichum)swamps to maintain themselves near the northern limit of their range depends on their levels of production, which is not only are response to climate but also to local environmental factors(e.g., impoundment). We asked if primary production was reduced under impounded conditions and if species' responses to impoundment were individualistic or more gen
Authors
B.A. Middleton, K.L. McKee
Probabilistic liquefaction triggering based on the cone penetration test
Performance-based earthquake engineering requires a probabilistic treatment of potential failure modes in order to accurately quantify the overall stability of the system. This paper is a summary of the application portions of the probabilistic liquefaction triggering correlations proposed recently proposed by Moss and co-workers. To enable probabilistic treatment of liquefaction triggering, the v
Authors
R.E.S. Moss, R.B. Seed, R. E. Kayen, J.P. Stewart, K. Tokimatsu
Radar stage uncertainty
The U.S. Geological Survey is investigating the performance of radars used for stage (or water-level) measurement. This paper presents a comparison of estimated uncertainties and data for radar water-level measurements with float, bubbler, and wire weight water-level measurements. The radar sensor was also temperature-tested in a laboratory. The uncertainty estimates indicate that radar measuremen
Authors
J.M. Fulford, W.J. Davies
Radiated energy and the physics of earthquake faulting
[No abstract available]
Authors
A. McGarr, R.E. Abercrombie, H. Kanamori
Rainfall-induced landslides in Puerto Rico: An overview
Rainfall-induced landslides are common in Puerto Rico (PR). The presence of steep slopes in mountainous terrain, coupled with weathered soils and intense rainfall, leads to severe slope-stability problems throughout the island. Episodic triggering events such as hurricanes and earthquakes further exacerbate these problems. All physiographic provinces of the island have experienced landslides. The
Authors
M.A. Pando, M.E. Ruiz, M. C. Larsen
Rainfall-runoff in the Albuquerque, New Mexico, area: Measurements, analyses and comparisons
Albuquerque, New Mexico, has experienced significant growth over the last 20 years like many other cities in the Southwestern United States. While the US population grew by 37% between the 1970 and 2000 censuses, the growth for Albuquerque was 83%. More people mean more development and increased problems of managing runoff from urbanizing watersheds. The U.S. Geological Survey (USGS) in cooperatio
Authors
C.E. Anderson, T.J. Ward, T. Kelly
Rapid differentiation of refined fuels using negative electrospray ionization/mass spectrometry
Negative electrospray ionization/MS enabled rapid, specific, and selective screening for unique polar components at parts per million concentrations in commercial hydrocarbon products without extensive sample preparation, separation, chromatography, or quantitation. Commercial fuel types were analyzed with this method, including kerosene, jet fuel, white gas, charcoal lighter fluid, on-road and of
Authors
C.E. Rostad, F. D. Hostettler
Rapid differentiation of refined fuels using negative electrospray ionization/mass spectrometry
An application of electrospray ionization/mass spectrometry for identification of various commercially refined fuels using the unique signature of polar components, was investigated. The samples were analyzed by mass spectrometry using negative electrospray on an Agilent Series 1100 liquid chromatograph/mass spectrometer. These analysis were applied to hydrocarbon samples from a large, long-term f
Authors
C.E. Rostad, F. D. Hostettler
Real-time seismic monitoring and functionality assessment of a building
This paper presents recent developments and approaches (using GPS technology and real-time double-integration) to obtain displacements and, in turn, drift ratios, in real-time or near real-time to meet the needs of the engineering and user community in seismic monitoring and assessing the functionality and damage condition of structures. Drift ratios computed in near real-time allow technical asse
Authors
M. Çelebi
Recent advances to obtain real - Time displacements for engineering applications
This paper presents recent developments and approaches (using GPS technology and real-time double-integration) to obtain displacements and, in turn, drift ratios, in real-time or near real-time to meet the needs of the engineering and user community in seismic monitoring and assessing the functionality and damage condition of structures. Drift ratios computed in near real-time allow technical asse
Authors
M. Çelebi
Recent exploration activities and coal gas resource potential of the Gulf of Mexico Coastal Plain
No abstract available.
Authors
Peter D. Warwick