Publications
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Revised ages for tuffs of the Yellowstone Plateau volcanic field: Assignment of the Huckleberry Ridge Tuff to a new geomagnetic polarity event Revised ages for tuffs of the Yellowstone Plateau volcanic field: Assignment of the Huckleberry Ridge Tuff to a new geomagnetic polarity event
40Ar/39Ar ages were determined on the three major ash-flow tuffs of the Yellowstone Plateau volcanic field in the region of Yellowstone National Park in order to improve the precision of previously determined ages. Total-fusion and incremental- heating ages of sanidine yielded the following mean ages: Huckleberry Ridge Tuff—2.059 ± 0.004 Ma; Mesa Falls Tuff— 1.285 ± 0.004 Ma; and Lava...
Authors
M. A. Lanphere, D.E. Champion, R.L. Christiansen, G. A. Izett, J. D. Obradovich
Simulation of broadband ground motion including nonlinear soil effects for a magnitude 6.5 earthquake on the Seattle fault, Seattle, Washington Simulation of broadband ground motion including nonlinear soil effects for a magnitude 6.5 earthquake on the Seattle fault, Seattle, Washington
The Seattle fault poses a significant seismic hazard to the city of Seattle, Washington. A hybrid, low-frequency, high-frequency method is used to calculate broadband (0-20 Hz) ground-motion time histories for a M 6.5 earthquake on the Seattle fault. Low frequencies (1 Hz) are calculated by a stochastic method that uses a fractal subevent size distribution to give an ω-2 displacement...
Authors
S. Hartzell, A. Leeds, A. Frankel, R. A. Williams, J. Odum, W. Stephenson, W. Silva
The proximal part of the giant submarine Wailau landslide, Molokai, Hawaii The proximal part of the giant submarine Wailau landslide, Molokai, Hawaii
The main break-in-slope on the northern submarine flank of Molokai at -1500 to -1250 m is a shoreline feature that has been only modestly modified by the Wailau landslide. Submarine canyons above the break-in-slope, including one meandering stream, were subaerially carved. Where such canyons cross the break-in-slope, plunge pools may form by erosion from bedload sediment carried down the...
Authors
D.A. Clague, J.G. Moore
Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska Seismological evidence for a sub-volcanic arc mantle wedge beneath the Denali volcanic gap, Alaska
Arc volcanism in Alaska is strongly correlated with the 100 km depth contour of the western Aluetian Wadati-Benioff zone. Above the eastern portion of the Wadati-Benioff zone however, there is a distinct lack of volcanism (the Denali volcanic gap). We observe high Poisson's ratio values (0.29-0.33) over the entire length of the Alaskan subduction zone mantle wedge based on regional...
Authors
D.E. McNamara, M.E. Pasyanos
Stability assessment of a Hurricane Mitch-induced landslide dam on the Rio La Lima, Sierra de Las Minas, eastern Guatemala Stability assessment of a Hurricane Mitch-induced landslide dam on the Rio La Lima, Sierra de Las Minas, eastern Guatemala
No abstract available.
Authors
Robert L. Schuster, Robert C. Bucknam, Manuel Antonio Mota
Socioeconomic and environmental impacts of landslides in the Western Hemisphere Socioeconomic and environmental impacts of landslides in the Western Hemisphere
In spite of improvements in recognition, prediction, mitigative measures, and warning systems, economic losses and casualties due to landslides in the Western Hemisphere appear to be growing as a result of increasing development of landslide-prone areas due to population pressures. This paper notes outstanding examples of socioeconomic losses in the Americas. Landslides impact the...
Authors
Robert L. Schuster, Lynn M. Highland
Observations and recommendations regarding landslide hazards related to the January 13, 2001 M-7.6 El Salvador earthquake Observations and recommendations regarding landslide hazards related to the January 13, 2001 M-7.6 El Salvador earthquake
The January 13, 2001 earthquake (M-7.6) off the coast of El Salvador triggered widespread damaging landslides in many parts of the El Salvador. In the aftermath of the earthquake, the Salvadoran government requested technical assistance through the U.S. Agency for International Development (USAID); USAID, in turn, requested help from technical experts in landslide hazards from the U.S...
Authors
Randall W. Jibson, Anthony J. Crone
Flash-flood related hazards: landslides, with examples from the December 1999 disaster in Venezuela Chapter 24 Flash-flood related hazards: landslides, with examples from the December 1999 disaster in Venezuela Chapter 24
No abstract available.
Authors
Matthew C. Larsen, Maria Teresa Vasquez-Conde, R.A. Clark
Assessment of landslide hazards resulting from the February 13, 2001, El Salvador earthquake; a report to the government of El Salvador and the U. S. Agency for International Development Assessment of landslide hazards resulting from the February 13, 2001, El Salvador earthquake; a report to the government of El Salvador and the U. S. Agency for International Development
On February 13, 2001, a magnitude 6.5 earthquake occurred about 40 km eastsoutheast of the capital city of San Salvador in central El Salvador and triggered thousands of landslides in the area east of Lago de Ilopango. The landslides are concentrated in a 2,500-km2 area and are particularly abundant in areas underlain by thick deposits of poorly consolidated, late Pleistocene and...
Authors
Rex L. Baum, Anthony J. Crone, Demetreo Escobar, Edwin L. Harp, Jon J. Major, Mauricio Martinez, Carlos Pullinger, Mark E. Smith
Did you feel it? Community-made earthquake shaking maps Did you feel it? Community-made earthquake shaking maps
Since the early 1990's, the magnitude and location of an earthquake have been available within minutes on the Internet. Now, as a result of work by the U.S. Geological Survey (USGS) and with the cooperation of various regional seismic networks, people who experience an earthquake can go online and share information about its effects to help create a map of shaking intensities and damage...
Authors
D.J. Wald, L. A. Wald, J. W. Dewey, Vince Quitoriano, Elisabeth Adams
The rainfall-triggered landslide and flash-flood disaster in northern Venezuela, December 1999 The rainfall-triggered landslide and flash-flood disaster in northern Venezuela, December 1999
Rainstorms in December 1999 induced thousands of landslides along the northern slopes of the Cordillera de la Costa mountain range principally in the state of Vargas, Venezuela. Rainfall accumulation of 293 millimeters during the first 2 weeks ofDecember was followed by an additional 911 millimeters of rainfall on December 14 through 16. The landslides and floods inundated coastal...
Authors
Matthew C. Larsen, Gerald F. Wieczorek, L.S. Eaton, Heriberto Torres-Sierra