Source parameters of the 28 October 1983 Borah Peak, Idaho, earthquake from body wave analysis
- Creators
- Doser, Diane I.
- Smith, Robert B.
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.
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).Attached Files
Published - 1041.full.pdf
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Additional details
- Eprint ID
- 48422
- Resolver ID
- CaltechAUTHORS:20140812-135139750
- 14-08-0001-21856
- USGS
- Created
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2014-08-12Created from EPrint's datestamp field
- Updated
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2023-10-17Created from EPrint's last_modified field