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Rupture history of the 1984 Morgan Hill, California, earthquake from the inversion of strong motion records

Hartzell, Stephen H. and Heaton, Thomas H. (1986) Rupture history of the 1984 Morgan Hill, California, earthquake from the inversion of strong motion records. Bulletin of the Seismological Society of America, 76 (3). pp. 649-674. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20121121-103555819

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Abstract

Near-source strong motion velocity records and teleseismic short-period P waveforms are modeled to obtain the spatial and temporal distribution of slip for the 1984 Morgan Hill earthquake. Both forward modeling and constrained, least-squares inversion techniques are used to interpret the strong motion velocity waveforms in the frequency range of approximately 0.2 to 2.0 Hz. These data support a nearly unilateral rupture to the southeast with a rupture propagation velocity of nine-tenths of the local S-wave velocity. The majority of the slip occurs over a fault length of 25 km and to a first approximation can be interpreted as two main source regions, each with an extent of about 5 km with their centers separated by about 12 km. However, each of the sources has detailed structure of its own, and a simple two-point-source model is not an accurate representation of the Morgan Hill earthquake. The second source occurs about 4.5 sec after the first and is approximately 3 times larger. The maximum dislocation on the fault plane is about 1 m. The total moment of the earthquake is estimated to be 2.1 × 10^(25) dyne-cm. The Morgan Hill earthquake offers convincing evidence for very inhomogeneous slip and stress distributions on shallow strike-slip faults.


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http://bssa.geoscienceworld.org/content/76/3/649.abstractPublisherUNSPECIFIED
Additional Information:© 1986 Seismological Society of America. Manuscript received 25 October 1985. The authors thank Homer Givin of IBM Corporation and Robert Nigbor of Kinemetrics for supplying the strong motion record from the IBM Santa Teresa free-field site. The manuscript was significantly improved by thoughtful reviews from Paul Spudich and William Joyner. Carol Horn typed the manuscript.
Record Number:CaltechAUTHORS:20121121-103555819
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121121-103555819
Official Citation: Stephen H. Hartzell and Thomas H. Heaton Rupture history of the 1984 Morgan Hill, California, earthquake from the inversion of strong motion records Bulletin of the Seismological Society of America, June 1986, v. 76, p. 649-674
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35603
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 Nov 2012 18:45
Last Modified:30 Jul 2014 17:05

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