Publications
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Analysis of seismograms from a downhole array in sediments near San Francisco Bay
A four-level downhole array of three-component instruments was established on the southwest shore of San Francisco Bay to monitor the effect of the sediments on low-amplitude seismic ground motion. The deepest instrument is at a depth of 186 meters, two meters below the top of the Franciscan bedrock. Earthquake data from regional distances (29 km ≤ Δ ≤ 485 km) over a wide range of azimuths are com
Authors
William B. Joyner, Richard E. Warrick, Adolph A. Oliver
15/16 ips Operation of the Precision Instrument Company Model P15100 tape recorder to record the standard (30 Hz) NCER seismic data multiplex system
In recent months the need has arisen to record special seismic networks consisting of a dozen or more standard NCER seismic systems telemetered to a central collection point on a reliable, portable, low-power tape recorder. Because of its simplicity and the ease with which it can be adapted for the purpose, the PI 5100 field recorder should be considered for such use. In the tests described here,
Authors
Jerry P. Eaton
Prediction of maximum earthquake intensities for the San Francisco Bay region
No abstract available.
Authors
Roger D. Borcherdt
Crustal movement investigations
Studies of horizontal crustal movement using conventional geodetic methods have been considerably expanded in the quadrennium 1971–1974. The basic fault monitor Geodimeter network now covers most of the major faults in California as well as the zone of faulting that extends into Nevada. Isolated Geodimeter networks in seismic areas of Montana, New Mexico, Utah, and Washington are also monitored. P
Authors
James C. Savage
Seismic profiles of the offshore Gulf of Alaska Tertiary Province, R/V Thompson, Sept.-Oct. 1974
No abstract available.
Authors
Roland E. von Huene, B. F. Molnia, T. R. Bruns, P. R. Carlson
A model for earthquakes near Palisades Reservoir, southeast Idaho
The Palisades Reservoir seems to be triggering earthquakes: epicenters are concentrated near the reservoir, and quakes are concentrated in spring, when the reservoir level is highest or is rising most rapidly, and in fall, when the level is lowest. Both spring and fall quakes appear to be triggered by minor local stresses superposed on regional tectonic stresses; faulting is postulated to occur wh
Authors
David Schleicher
The orthoenstatite to clinoenstatite transformation by shearing and reversion by annealing: Mechanism and potential applications
Clinoenstatite (CE) was produced by deforming single-crystal specimens of ortho-enstatite (OE) in several different sorta of experiments. Examination with light and trans-mission electron microscopes shows that the transformation is coherent and involves a macroscopic shear on (100) [001] through an angle of 12.8±1.3 °, in good agreement with the theoretically expected value of 13.3 °, and that th
Authors
R. S. Coe, Stephen H. Kirby
The 1959 Hebgen Lake, Montana, earthquake: Two geological points of view
No abstract available.
Authors
Irving J. Witkind
Notes on some experiments on the application of subtractive compensation to USGS seismic magnetic tape recording and playback systems
The purpose of these experiments is to lay the groundwork for the implementation of subtractive compensation of the USGS seismic network tape playbacks utilizing the Develco model 6203 discriminators at a x1 playback speed. Although the Develco discriminators were designed for this application and a matching Develco compensation discriminator was purchased, effective use of this system for subtrac
Authors
Jerry P. Eaton
Earthquake mechanism and displacement fields close to fault zones: Report on the Sixth GEOP Research Conference
The Sixth Geodesy/Solid Earth and Ocean Physics (GEOP) Research Conwas held on February 4–5, 1974, at the Institute of Geophysics and Planetary Physics, University of California, San Diego, in La Jolla, California. It was attended by about 100 persons.James N. Brune, program chairman, opened the conference and delivered the introductory address, a somewhat extended version of which is printed else
Authors
Craig R. Allen, Jon Berger, Ivan I. Mueller, James C. Savage, J. Weertman
Geodetic determination of strain at the Nevada Test Site following the Handley event
Repeated surveys of a trilateration network (aperture greater than 20 km) centered on ground zero for the HANDLEY event, a nuclear explosion at the Nevada Test Site with yield in excess of 1 megaton, suggest that the explosion induced an east-west extension of the network by more than 50 mm. In the year following the detonation, this deformation reversed such that the final configuration represent
Authors
James C. Savage, W. T. Kinoshita, W. H. Prescott
Effects of the Bear Valley and San Juan Bautista earthquakes of 1972 on Geodimeter line lengths
Measurements of lines of the California Geodimeter network in the vicinity of the epicenters of four 1972 earthquakes (magnitudes 4.7, 4.7, 4.8, and 5.1) along the San Andreas fault system indicate that no significant anomalous changes in line length preceded or accompanied those earthquakes. Within the precision of measurement, the data are consistent with a linear change in line length with time
Authors
W. H. Prescott, James C. Savage