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A three-dimensional dislocation model for the San Fernando, California, earthquake of February 9, 1971

Trifunac, M. D. (1974) A three-dimensional dislocation model for the San Fernando, California, earthquake of February 9, 1971. Bulletin of the Seismological Society of America, 64 (1). pp. 149-172. ISSN 0037-1106.

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The data from five strong-motion accelerograph stations centered above and surrounding the fault are used to develop an approximate three-dimensional dislocation model for the San Fernando earthquake. In the resulting model, the dislocation originates near the instrumentally determined epicenter at a depth of 9.2 km and then propagates southward and upward with a velocity of 2 km/sec. Calculated dislocation amplitudes of about 10 m in the hypocentral region have been found to decay to about 1 m toward the center of the fault and then build up again to about 6 m just before the fault intersects the ground surface in the San Fernando Valley. The assumed fault area of 130 km^2 and the assumed rigidity µ = 3 × 10^(11) dyne/cm^2 give a moment M_0 = 1.53 × 10^(26) dyne-cm. This study indicates that, with several strong-motion accelerographs suitably located in the epicentral region, it is possible to find a kinematic faulting process associated with the periods of ground motion which are longer than about 1 sec.

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Additional Information:Copyright © 1974, by the Seismological Society of America. Manuscript received June 4, 1973. I am indebted to R. Alewine, B. Minster, T. C. Hanks, and F. E. Udwadia for critical reading of the manuscript and for offering many valuable suggestions. This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research under Contract F44620-72-C-0097.
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Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F44620-72-C-0097
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48394
Deposited By: George Porter
Deposited On:12 Aug 2014 21:35
Last Modified:03 Oct 2019 07:03

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