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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Stratigraphy, geochemistry and tectonic significance of the Oligocene magmatic rocks of western Oaxaca, southern Mexico Stratigraphy, geochemistry and tectonic significance of the Oligocene magmatic rocks of western Oaxaca, southern Mexico
In Western Oaxaca, Tertiary magmatic activity is represented by extensive plutons along the continental margin and volcanic sequences in the inland region. K-Ar age determinations reported previously and in the present work indicate that these rocks correspond to a relatively broad arc in this region that was active mainly during the Oligocene (~ 35 to ~ 25 Ma). In the northern sector of...
Authors
B. Martiny, R. G. Martinez-Serrano, D. J. Moran-Zenteno, C. MacIas-Romo, R. A. Ayuso
Stress history and geotechnical properties of sediment from the Cape Fear Diapir, Blake Ridge Diapir, and Blake Ridge Stress history and geotechnical properties of sediment from the Cape Fear Diapir, Blake Ridge Diapir, and Blake Ridge
Geotechnical properties of sediment from Ocean Drilling Program Leg 164 are presented as: (1) normalized shipboard strength ratios from the Cape Fear Diapir, the Blake Ridge Diapir, and the Blake Ridge; and (2) Atterberg limit, vane shear strength, pocket-penetrometer strength, and constant-rate-of-strain consolidation results from Hole 995A, located on the Blake Ridge. This study was...
Authors
W.J. Winters
Studies of volcanoes of Alaska by satellite radar interferometry Studies of volcanoes of Alaska by satellite radar interferometry
Interferometric synthetic aperture radar (InSAR) has provided a new imaging geodesy technique to measure the deformation of volcanoes at tens-of-meter horizontal resolution with centimeter to subcentimeter vertical precision. The two-dimensional surface deformation data enables the construction of detailed numerical models allowing the study of magmatic and tectonic processes beneath...
Authors
Z. Lu, C. Wicks, D. Dzurisin, W. Thatcher, J. Power
Summary of the MAIA Working Conference Summary of the MAIA Working Conference
From November 30 to December 2, 1998, the Mid-Atlantic Integrated Assessment (MAIA) held a Working Conference in Baltimore, Maryland (USA). The Conference presented the results from several of its activities and programs to scientists, environmental managers, and the general public. The attendees provided feedback on the usefulness of the MAIA program's activities, and suggested...
Authors
M.P. Bradley, B.S. Brown, S.S. Hale, F.W. Kutz, R.B. Landy, R. Shedlock, R. Mangold, A. Morris, W. Galloway, J.S. Rosen, R. Pepino, B. Wiersma
Survival of IHN virus in different environments and a molecular tool to monitor virus distribution Survival of IHN virus in different environments and a molecular tool to monitor virus distribution
Abstract not available
Authors
S. LaPatra, R. Troyer, W. Shewmaker, G. Jones, G. Kurath
Test functions for three-dimensional control-volume mixed finite-element methods on irregular grids Test functions for three-dimensional control-volume mixed finite-element methods on irregular grids
Numerical methods based on unstructured grids, with irregular cells, usually require discrete shape functions to approximate the distribution of quantities across cells. For control-volume mixed finite-element methods, vector shape functions are used to approximate the distribution of velocities across cells and vector test functions are used to minimize the error associated with the...
Authors
R.L. Naff, T.F. Russell, J. D. Wilson
Testing a multi-tiered stress-gradient model for risk assessment using sediment constituents from coral reef environments Testing a multi-tiered stress-gradient model for risk assessment using sediment constituents from coral reef environments
Coral reefs are threatened worldwide by stresses ranging from local to global in extent. One of the major challenges in studies of reef decline is understanding how to distinguish between changes resulting from natural, anthropogenic, local, and global environmental perturbations. As such, a conceptual risk-assessment model is developed that includes tiers for natural stresses, global...
Authors
B. H. Lidz, P. Hallock
The Halekulani Sand Channel and Makua Shelf sediment deposits: Are they a sand resource for replenishing Waikiki's beaches? The Halekulani Sand Channel and Makua Shelf sediment deposits: Are they a sand resource for replenishing Waikiki's beaches?
The Halekulani Sand Channel and the Makua Shelf off the south shore of Oahu contain at least 1.3 million m3 of sediment that is a possible resource for nourishing degraded sections of Waikiki Beach. A sidescan sonar survey indicates continuous sediment cover within the channel and on the shelf, and samples from the top and bottom of vibracores from the channel and shelf contain from 29%...
Authors
M. A. Hampton, C.H. Fletcher, J.H. Barry, S.J. Lemmo
The Upper Midwest Aerospace Consortium Environmental Information Network: Building ‘Learning Communities’ in the Northern Great Plains The Upper Midwest Aerospace Consortium Environmental Information Network: Building ‘Learning Communities’ in the Northern Great Plains
In the last two decades alone, the U.S. and large portions of the world have witnessed what can be aptly be described as an explosion of scientific information and technological innovations that has permeated almost every aspect of our lives. Given these trends, it is clear that science and the understanding of science are becoming increasingly more relevant and essential to decision...
Authors
Leigh Welling, George Seielstad, Pat McClurg, Daniel B. Fagre
Thermal exposure of wild juvenile fall Chinook salmon in Little Goose Reservoir, Snake River Thermal exposure of wild juvenile fall Chinook salmon in Little Goose Reservoir, Snake River
No abstract available
Authors
D.A. Venditti, J.M. Kraut, D.W. Rondorf
Thiamine status of Tennessee and Great Lakes walleye populations: Report on early mortality syndrome workshop Thiamine status of Tennessee and Great Lakes walleye populations: Report on early mortality syndrome workshop
No abstract available at this time
Authors
D. C. Honeyfield, C.S. Vandergoot, P.W. Bettoli, J. P. Hinterkopf, J.L. Zajicek
Three archives of the U. S. Geological Survey's Western Mineral Resources Team Three archives of the U. S. Geological Survey's Western Mineral Resources Team
The Western Mineral Resources Team of the U.S. Geological Survey (USGS) has three archives, which hold unpublished or difficult-to-obtain records and literature. The Technical Data Unit in Anchorage, Alaska, holds maps, field notes, and other records of the USGS work in Alaska. The USGS Field Office in Spokane, Washington, houses the more than 5,000 files from Federal government...
Authors
Karen Sue Bolm, David G. Frank, Jill L. Schneider