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An array of strong-motion accelerographs in Bear Valley, California

Dielman, Richard J. and Hanks, Thomas C. and Trifunac, Mihailo D. (1975) An array of strong-motion accelerographs in Bear Valley, California. Bulletin of the Seismological Society of America, 65 (1). pp. 1-12. ISSN 0037-1106.

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Fifteen strong-motion accelerographs, each with the capability of writing the WWVB absolute time code on the recorded accelerogram, have been deployed in an elliptical array, at a station spacing of several kilometers, along the San Andreas Fault in the Bear Valley region of central California. Ten accelerograms were obtained for the June 22, 1973, earthquake (M = 3.9), located near the center of the array. Preliminary analyses of these accelerograms support previous suggestions that the crystalline rocks of the Gabilan Range possess higher material velocities and lower intrinsic absorption than do the Cretaceous and Cenozoic sedimentary rocks northeast of the fault zone. These accelerograms clearly indicate that a strong-motion accelerograph array of this sort can provide the basic data for source mechanism, wave propagation, and local ground-motion studies for earthquakes with magnitudes as small as 3.5-4.0.

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Additional Information:Copyright © 1975, by the Seismological Society of America. Manuscript received April 10, 1974. We have appreciated the cooperation and patience of the property owners and local residents who have generously provided space for instrument installations: AGH, the Almaden Winery and Mrs. L. Dewitt; BCN, WMV, and MLR, Charlotte Berberick; BVF, Bear Valley Fire Station and Richard T. Gilbert; GCR, George H. Callens; HSR, Hannes Schroll; JSR, Mr. P. James; PNM, Pinnacles National Monument and Pat Patterson; SCO, Stone Canyon Observatory and Mr. R. Thompson; SMR, Jeff H. Schmidt; UBR, Charley Strohn; WBR, Mrs. L. E. Webb; WKR, Mr. F. Wilkinson; WMR, Thomas H. Williams. W. E. Ellsworth of NCER, U.S. Geological Survey, kindly provided the earthquake locations and determined the station residuals. We also thank the Seismic Engineering Branch of the U.S. Geological Survey for allowing us to incorporate three of their existing accelerograph stations into the Bear Valley strong-motion array. This research was supported in part by the Advanced Research Project Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research under Contract F44620-72-C-0097 and by the Earthquake Research Affiliates Program of the California Institute of Technology.
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Air Force Office of Scientific Research (AFOSR)F44620-72-C-0097
Caltech Earthquake Research AffiliatesUNSPECIFIED
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48352
Deposited By: George Porter
Deposited On:12 Aug 2014 17:52
Last Modified:03 Oct 2019 07:02

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