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Teleseismic analysis of the 1980 Mammoth Lakes earthquake sequence

Given, Jeffrey W. and Wallace, Terry C. and Kanamori, Hiroo (1982) Teleseismic analysis of the 1980 Mammoth Lakes earthquake sequence. Bulletin of the Seismological Society of America, 72 (4). pp. 1093-1109. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20140903-083950180

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Abstract

The source mechanisms of the three largest events of the 1980 Mammoth Lakes earthquake sequence have been determined using surface waves recorded on the global digital seismograph network and the long-period body waves recorded on the WWSSN network. Although the fault-plane solutions from local data (Cramer and Toppozada, 1980; Ryall and Ryall, 1981) suggest nearly pure left-lateral strike-slip on north-south planes, the teleseismic waveforms require a mechanism with oblique slip. The first event (25 May 1980, 16^h 33^m 44^s) has a mechanism with a strike of N12°E, dip of 50°E, and a rake of −35°. The second event (27 May 19^h 44^m 51^s) has a mechanism with a strike of N15°E, dip of 50°, and a slip of −11°. The third event (27 May, 14^h 50^m 57^s) has a mechanism with a strike of N22°E, dip of 50°, and a rake of −28°. The first event is the largest and has a moment of 2.9 × 10^(25) dyne-cm. The second and third events have moments of 1.3 and 1.1 × 10^(25) dyne-cm, respectively. The body- and surface-wave moments for the first and third events agree closely while for the second event the body-wave moment (approximately 0.6 × 10^(25) dyne-cm) is almost a factor of 3 smaller than the surface-wave moment. The principal axes of extension of all three events is in the approximate direction of N65°E which agrees with the structural trends apparent along the eastern front of the Sierra Nevada.


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http://bssa.geoscienceworld.org/content/72/4/1093.abstractPublisherArticle
Additional Information:© 1982, by the Seismological Society of America. Manuscript received 2 November 1981. We thank Rob Cockerham and Ed Corbett for letting us use some unpublished first-motion data. Steve Hartzell and Pierre Saint-Amand critically reviewed the manuscript. We gratefully acknowledge the WWSSN observatories which sent us copies ·of the seismograms. The IDA data was made available by courtesy of the IDA project team at the Institute of Geophysics and Planetary Physics, University of California, San Diego. This work was supported by the U.S. Geological Survey Contracts 14-08-0001-19755 and 14-08-0001-19270.
Funders:
Funding AgencyGrant Number
USGS14-08-0001-19755
USGS14-08-0001-19270
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Caltech Division of Geological and Planetary Sciences3709
Record Number:CaltechAUTHORS:20140903-083950180
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140903-083950180
Official Citation: Jeffrey W. Given, Terry C. Wallace, and Hiroo Kanamori Teleseismic analysis of the 1980 Mammoth Lakes earthquake sequence Bulletin of the Seismological Society of America, August 1982, v. 72, p. 1093-1109
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49175
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Sep 2014 16:03
Last Modified:03 Sep 2014 16:03

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