Publications
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Geographic variation in ground shaking as a function of changes in near-surface properties and geologic structure near Los Angeles, California
No abstract available.
Authors
A. M. Rogers, Ladislaus C. Tinsley, Roger D. Borcherdt
Innovative approaches to landslide hazard and risk mapping
No abstract available.
Authors
E. E. Brabb
Deformation in the White Mountain seismic gap, California-Nevada, 1972-1982
A 100×40 km trilateration network extending from Bishop, California, to near Hawthorne, Nevada, crosses the east end of the Long Valley caldera, site of renewed magma inflation in the 1979–1980 interval, and spans most of the White Mountain seismic gap. The network was surveyed in 1972, 1973, 1976, 1979, 1980, and 1982. The 1980 survey may be contaminated by a scale error. In addition, leveling su
Authors
James C. Savage, Michael Lisowski
Earthquake swarm in Long Valley caldera, California, January 1983: Evidence for dike inflation
The 1982–1983 deformation observed by trilateration and leveling surveys across the Long Valley caldera is apparently related to the 8.5‐km‐long by 8‐km‐deep vertical rupture surface defined by the January 1983 earthquake swarm that occurred in the south moat of the caldera. The observed deformation can be explained as follows. In late 1982, 0.03 km3 of magma was injected into a dike that dips 30°
Authors
James C. Savage, R.S. Cockerham
Regional deformation near Palmdale, California, 1973-1983 (USA)
The Tehachapi trilateration network spans the intersection of the San Andreas and Garlock faults in southern California in the “Big Bend” region of the San Andreas fault. Analysis of data from 1973–1983 shows strain differences between the northwest and southeast regions of the network and slip at depth on both faults. The Palmdale network, spanning the San Andreas fault entirely within the Tehach
Authors
N.E. King, James C. Savage
A comparative ground response study near Los Angeles using recordings of Nevada nuclear tests and the 1971 San Fernando earthquake
A comparative ground response study at sites in the Los Angeles region is based on the extensive strong-motion data set recorded in the 1971 San Fernando earthquake and 159 three-component recordings of distant nuclear tests in Nevada. Amplitude spectral ratios computed for the nuclear test data over those frequency bands for which there is an adequate signal-to-noise ratio provide statistically s
Authors
A. M. Rogers, Roger D. Borcherdt, P. A. Covington, D. M. Perkins
On recent advances in strong-motion data acquisition capabilities
No abstract available.
Authors
Roger D. Borcherdt
A seismic refraction study of the Oregon Cascades
A 275‐km‐long reversed refraction profile in the Oregon Cascades, two shallow earthquakes of magnitude 5 in southern Washington, a shallow earthquake of magnitude 4.6 in northern California, and a previously published analysis of the Bouguer gravity field are used to develop a crustal P wave velocity model for the Oregon Cascades. Travel time analysis of the refraction profile indicates a crustal
Authors
Donald S. Leaver, Walter D. Mooney, W. M. Kohler
A seismic refraction survey of the Imperial Valley Region, California
The U.S. Geological Survey conducted an extensive seismic refraction survey in the Imperial Valley region of California in 1979. The Imperial Valley is located in the Salton Trough, an active rift between the Pacific and North American plates. Forty shots fired at seven shot points were recorded by 100 portable seismic instruments at typical spacing of 0.5–1 km. More than 1300 recording locations
Authors
Gary S. Fuis, Walter D. Mooney, J. H. Healy, G. A. McMechan, W. J. Lutter
Introduction and digest to the Special Issue on Chemical Effects of Water on the Deformation and Strengths of Rocks
The important role of pore pressure in promoting such brittle processes as cataclasis, hydraulic fracturing, large‐scale faulting, and earthquakes within the crust is widely accepted in geology and geophysics [, 1957; , 1959; , 1958; ., 1963; , 1968; ., 1968; ., 1976; , 1973, 1980; , 1981]. Provided that fluid pressure is fully communicated with rock pore space, the effective normal stresses that
Authors
Stephen H. Kirby
Experimental deformation of topaz crystals: Possible embrittlement by intracrystalline water
Crystallographically oriented single‐crystal prisms of gem quality topaz (composition AlSiO (OH− F) where x = 0.04 ± 0.01) were deformed at a confining pressure of 1.50 GPa, a temperature of 800°C, and a strain rate of 2×10 s. Under nearly identical conditions, all crystals of anhydrous rock‐forming minerals that have been tested to date, such as olivine, quartz, feldspars, pyroxenes, and refracto
Authors
R. W. Lee, Stephen H. Kirby