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Source parameters of the 28 October 1983 Borah Peak, Idaho, earthquake from body wave analysis

Doser, Diane I. and Smith , Robert B. (1985) Source parameters of the 28 October 1983 Borah Peak, Idaho, earthquake from body wave analysis. Bulletin of the Seismological Society of America, 75 (4). pp. 1041-1051. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20140812-135139750

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Abstract

Modeling of long-period body waves of the M_S = 7.3 Borah Peak, Idaho, earthquake suggests that the earthquake was a simple rupture that nucleated at a depth of about 16 km and propagated unilaterally northwestward toward the surface. The seismic moment tensor obtained from the inversion of teleseismic body wave amplitude data agrees well with the fault plane solution obtained from short-period first motion data (strike, 138 ± 3°; dip, 45 ± 3°; rake, −60 ± 5°) and the observed surface faulting. The scalar double couple moment of 2.1 × 10^(26) dyne-cm obtained from the inversion is comparable to a moment of 1.4 × 10^(26) dyne-cm estimated from the observed surface faulting. Estimates of stress drop based on these values for the moment are 17 to 12 bars, respectively.


Item Type:Article
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http://www.bssaonline.org/content/75/4/1041.abstractDOIArticle
Additional Information:© 1985 Seismological Society of America. Manuscript received 12 October 1984. We would like to thank W. D. Richins for providing aftershock information and useful comments. J. C. Pechmann, M. R. Baker, and H. Kanamori also gave helpful suggestions and comments. U. Vetter, J. Zollweg, S. R. Taylor, and T. Wallace kindly provided seismograms and/or first motion polarities for use in the fault plane solution determination. Comments from an anonymous reviewer are also appreciated. This work was supported by the U.S. Geological Survey Earthquake Hazards Reduction Program Contract to the University of Utah (14-08-0001-21856).
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Funding AgencyGrant Number
USGS14-08-0001-21856
Record Number:CaltechAUTHORS:20140812-135139750
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140812-135139750
Official Citation:Doser, D. I., & Smith, R. B. (1985). Source parameters of the 28 October 1983 Borah Peak, Idaho, earthquake from body wave analysis. Bulletin of the Seismological Society of America, 75(4), 1041-1051.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48422
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:12 Aug 2014 21:17
Last Modified:12 Aug 2014 21:17

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