Publications
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Two lithospheric profiles across southern California derived from gravity and seismic data Two lithospheric profiles across southern California derived from gravity and seismic data
We present two detailed 2-D density transects for the crust and uppermost mantle across southern California using a linear gravity inversion technique. This technique parameterizes the crust and upper mantle as a set of blocks that are based on published geologic and seismic models. Each block can have a range of densities that are constrained where possible by borehole measurements...
Authors
T. Romanyuk, Walter D. Mooney, Shane T. Detweiler
Post-earthquake investigations-exercising the NEHRP plan and development of a virtual clearinghouse concept Post-earthquake investigations-exercising the NEHRP plan and development of a virtual clearinghouse concept
No abstract available.
Authors
Thomas L. Holzer, Christopher Rojahn, Charles Scawthorn
Liquemap: A real-time post-earthquake map of liquefaction probability Liquemap: A real-time post-earthquake map of liquefaction probability
No abstract available.
Authors
Michael J. Bennett, Luke Blair, Thomas L. Holzer, Thomas E. Noce
Assessment of ground deformation due to soil liquefaction in the San Jose, California area by using geotechnical IT Assessment of ground deformation due to soil liquefaction in the San Jose, California area by using geotechnical IT
No abstract available.
Authors
Robert E. Kayen, Keith L. Knudsen, Satoshi Nagata, Yasuo Tanaka
Report of the workshop on Extreme Ground Motions at Yucca Mountain, August 23-25, 2004 Report of the workshop on Extreme Ground Motions at Yucca Mountain, August 23-25, 2004
This Workshop has its origins in the probabilistic seismic hazard analysis (PSHA) for Yucca Mountain, the designated site of the underground repository for the nation's high-level radioactive waste. In 1998 the Nuclear Regulatory Commission's Senior Seismic Hazard Analysis Committee (SSHAC) developed guidelines for PSHA which were published as NUREG/CR-6372, 'Recommendations for...
Authors
Thomas C. Hanks, N. A. Abrahamson, M. Board, D.M. Boore, J.N. Brune, C.A. Cornell
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Earthquake Hazards Program, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Earthquake Science Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Physical properties of two core samples from Well 34-9RD2 at the Coso geothermal field, California Physical properties of two core samples from Well 34-9RD2 at the Coso geothermal field, California
The Coso geothermal field, located along the Eastern California Shear Zone, is composed of fractured granitic rocks above a shallow heat source. Temperatures exceed 640 ?F (~338 ?C) at a depth of less than 10000 feet (3 km). Permeability varies throughout the geothermal field due to the competing processes of alteration and mineral precipitation, acting to reduce the interconnectivity of...
Authors
C.A. Morrow, D.A. Lockner
A new class of earthquake observations A new class of earthquake observations
No abstract available.
Authors
Frederick Pollitz
Urban seismic hazard mapping for Memphis, Shelby County, Tennessee Urban seismic hazard mapping for Memphis, Shelby County, Tennessee
Earthquakes cannot be predicted, but scientists can forecast how strongly the ground is likely to shake as a result of an earthquake. Seismic hazard maps provide one way of conveying such forecasts. The U.S. Geological Survey (USGS), which produces seismic hazard maps for the Nation, is now engaged in developing more detailed maps for vulnerable urban areas. The first set of these maps...
Authors
Joan Gomberg
Reply to comment by Y. Ben-Zion on “Material contrast does not predict earthquake rupture propagation direction” Reply to comment by Y. Ben-Zion on “Material contrast does not predict earthquake rupture propagation direction”
No abstract available.
Authors
Ruth A. Harris, Steven M. Day
Subsurface structure of the East Bay Plain ground-water basin: San Francisco Bay to the Hayward fault, Alameda County, California Subsurface structure of the East Bay Plain ground-water basin: San Francisco Bay to the Hayward fault, Alameda County, California
The area of California between the San Francisco Bay, San Pablo Bay, Santa Clara Valley, and the Diablo Ranges (East Bay Hills), commonly referred to as the 'East Bay', contains the East Bay Plain and Niles Cone ground-water basins. The area has a population of 1.46 million (2003 US Census), largely distributed among several cities, including Alameda, Berkeley, Fremont, Hayward, Newark...
Authors
R. D. Catchings, J. W. Borchers, M. R. Goldman, G. Gandhok, D. A. Ponce, C. E. Steedman
Seismic constraints and coulomb stress changes of a blind thrust fault system, 2: Northridge, California Seismic constraints and coulomb stress changes of a blind thrust fault system, 2: Northridge, California
We review seismicity, surface faulting, and Coulomb stress changes associated with the 1994 Northridge, California, earthquake. All of the observed surface faulting is shallow, extending meters to tens of meters below the surface. Relocated aftershocks reveal no seismicity shallower than 2 km depth. Although many of the aftershocks lie along the thrust fault and its up-dip extension...
Authors
Ross S. Stein, Jian Lin
Seismic constraints and Coulomb stress changes of a blind thrust fault system, 1: Coalinga and Kettleman Hills, California Seismic constraints and Coulomb stress changes of a blind thrust fault system, 1: Coalinga and Kettleman Hills, California
This report reviews the seismicity and surface ruptures associated with the 1982-1985 earthquake sequence in the Coalinga region in California, and the role of Coulomb stress in triggering the mainshock sequence and aftershocks. The 1982-1985 New Idria, Coalinga, and Kettleman Hills earthquakes struck on a series of west-dipping, en echelon blind thrust faults. Each earthquake was...
Authors
Jian Lin, Ross S. Stein