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Bulletin of the Seismological Society of America; February 1997; v. 87; no. 1; p. 11-22
© 1997 Seismological Society of America
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The MS = 7.3 1992 Suusamyr, Kyrgyzstan, earthquake: 1. Constraints on fault geometry and source parameters based on aftershocks and body-wave modeling

R. J. Mellors, F. L. Vernon, G. L. Pavlis, G. A. Abers, M. W. Hamburger, S. Ghose and B. Iliasov

Institute of Geophysics and Planetary Physics University of California, San Diego, La Jolla, California, 92037mellors{at}yin.ucsd.edu
Department of Geological Sciences Indiana University, Bloomington, Indiana 47401
Department of Geological Sciences University of Kansas, Lawrence, Kansas 66044
Kyrgyz Institute of Seismology, Bishkek, Kyrgyzstan

Abstract

We investigated the Suusamyr, Kyrgyzstan, earthquake of 19 August 1992, using aftershock data, teleseismic body-wave modeling, and field observations. Aftershocks were recorded by the IRIS Kyrgyzstan broadband network, a temporary six-station aftershock network, and a regional network operated by the Kyrgyz Institute of Seismology. The aftershocks, which range in depth from the surface to 18 km, defined a 50 ± 10-km-long rupture zone that dips 50° ± 13° to the south and strikes roughly east-west. The base of the eastern end of the aftershock zone shallowed to the east along strike and may represent a lateral ramp. The surface ruptures also had an east-west strike and dipped south, but the total length (less than 4 km) was much shorter than the aftershock zone. A teleseismic body-wave inversion, using a point source and a directivity correction, yields a focal mechanism with a strike of 221°, dip of 46°, and a slip of 43°. We obtained a moment of 4.1 x 1019 N-m with a centroid depth between 5 and 21 km. The rupture propagated along an azimuth of 330° ± 60°, which matches the relative location of the mainshock with respect to the aftershock zone. The results of the aftershock study and teleseismic inversion yield a clear picture of the fault geometry of a large-thrust earthquake.




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