Seismic Slip Distribution along the San Jacinto Fault Zone, Southern California, and Its Implications
Abstract
The amount and distribution of seismic slip along 240 km of the San Jacinto fault zone between Cajon Pass and Superstition Mountain has been obtained from determinations of seismic moment and estimates of source dimension for each of the nine moderate earthquakes (6 < M < 7) which have occurred there since 1890. There are two significant gaps in seismic slip, one between Cajon Pass and Riverside, the other from Anza to Coyote Mountain. Each is about 40 km long and both are characterized by complex fault zones and a currently high level of minor seismicity (M < 5). No aseismic fault creep has been identified on either segment. These gaps may mark the sites of the next moderate earthquakes (M = 6 → 7) to occur along the San Jacinto fault zone. The two remaining sections of the fault, Riverside and Anza, and Coyote Mountain to Superstition Mountain, may have been ruptured along their entire lengths, in 1890–1923 and 1942–1968, respectively.
Additional Information
© 1975 Geological Society of America. Manuscript received by the Society July 4, 1974; Revised manuscript received February 18, 1975; Manuscript accepted March 7, 1975. Doc. no. 50814. The staff of the Seismographic Station of the University of California at Berkeley, particularly T. V. McEvilly, are thanked for their assistance in providing access to the seismographic records from the Berkeley station. R. V. Sharp, D. P. Hill, and J. C. Savage provided helpful discussion. M. M. Clark's careful review considerably improved the manuscript.Additional details
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- CaltechAUTHORS:20190911-095913842
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2019-09-11Created from EPrint's datestamp field
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2021-11-16Created from EPrint's last_modified field
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- Seismological Laboratory