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Rupture patterns and preshocks of large earthquakes in the southern San Jacinto fault zone

Sanders, Chris and Magistrale, Harold and Kanamori, Hiroo (1986) Rupture patterns and preshocks of large earthquakes in the southern San Jacinto fault zone. Bulletin of the Seismological Society of America, 76 (5). pp. 1187-1206. ISSN 0037-1106.

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We relocated the large 1937, 1942, and 1954 earthquakes in the San Jacinto fault zone. The epicenters of the main shocks, aftershocks, and some preshocks were determined using empirical station corrections from recent small events in the study areas. The 1937 (ML 5.9) earthquake has an epicenter between the surface traces of the San Jacinto and Buck Ridge faults, and aftershocks suggest about 7 km of rupture predominantly to the northwest. A significant increase in small earthquake activity occurred about Formula yr before this event. The 1954 (M_L 6.2) earthquake is located at the southeast end of the mapped trace of the San Jacinto fault, and aftershocks suggest about 15 km of rupture further southeast into an area of folded young sediments with no surface fault trace. This event was preceded by a cluster of small earthquakes which occurred within an 8-hr period 10 weeks before the main event and in the eventual rupture zone. The 1942 (M_L 6.3) earthquake is located southwest of the southeast end of the Coyote Creek fault. Large aftershocks of this event are spread over a 15 by 18 km area southwest of the Coyote Creek fault and are not associated with any one fault. The relation of the 1942 event to the San Jacinto fault zone is not simple.

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Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 1986 Seismological Society of America. Manuscript received 28 January 1986. We appreciate a critical review by Jim Pechmann and comments by Tom Hanks, Tom Rockwell, and Kerry Sieh. This research was supported by U.S. Geological Survey Contract 14-08-0001-21981 and Grant 14-08-0001-G1170.
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Caltech Division of Geological and Planetary Sciences4305
Issue or Number:5
Record Number:CaltechAUTHORS:20140902-110504324
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49109
Deposited By: Tony Diaz
Deposited On:02 Sep 2014 19:32
Last Modified:09 Mar 2020 13:18

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