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The 1992 Landers earthquake sequence: Earthquake occurrence and structural heterogeneities

Zhao, Dapeng and Kanamori, Hiroo (1993) The 1992 Landers earthquake sequence: Earthquake occurrence and structural heterogeneities. Geophysical Research Letters, 20 (11). pp. 1083-1086. ISSN 0094-8276.

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The June 28, 1992, Mw 7.3 Landers earthquake occurred in the southeastern Mojave Desert, California. Over 10,000 aftershocks of the earthquake were recorded by the Caltech-USGS Southern California Seismic Network (SCSN) in 1992. To investigate the relationship between complexities in the crustal structure and variations in seismicity, we have used a tomographic method to invert 145,098 P wave arrival times from 3740 Landers earthquake aftershocks and 1148 other events recorded by 60 permanent and temporary SCSN stations. We determined a detailed P wave tomographic image with a spatial resolution of about 5 km and relocated the hypocenters with the obtained 3-D velocity model. The results show a correlation between seismicity patterns and velocity patterns and a tendency for regions rich in seismicity to be associated with higher velocities. The higher velocity areas are considered to be strong and brittle parts of the fault zone, which are apt to generate earthquakes. In contrast, low velocity areas are probably more ductile and weaker, allowing aseismic slippage.

Item Type:Article
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URLURL TypeDescription DOIArticle
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 1993 American Geophysical Union. Paper number 93GL01239. Received: February 11, 1993; Accepted: March 30, 1993. We appreciate the helpful discussions with D. L. Anderson, T. Heaton, K. Aki and E. Humphreys. D. Wald and two anonymous referees critically read the manuscript and gave us helpful comments, which improved the manuscript. The first author (DZ) was supported by the Southern California Earthquake Center (SCEC) and this is SCEC Publication No. 27. This work was partially supported by a National Science Foundation grant, EAR-92-04748. Contribution No. 5247, Division of Geological and Planetary Sciences, California Institute of Technology.
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Southern California Earthquake Center (SCEC)UNSPECIFIED
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Caltech Division of Geological and Planetary Sciences 5247
Southern California Earthquake Center27
Issue or Number:11
Record Number:CaltechAUTHORS:20141111-111935127
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51577
Deposited By: Tony Diaz
Deposited On:11 Nov 2014 19:41
Last Modified:03 Oct 2019 07:34

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