| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
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.
This article has been cited by other articles:
|
|
 |
|
  Y. Xu, S. W. Roecker, R. Wei, W. Zhang, and B. Wei Analysis of Seismic Activity in the Crust from Earthquake Relocation in the Central Tien Shan Bulletin of the Seismological Society of America, April 1, 2006; 96(2): 737 - 744. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. G. Martynov, F. L. Vernon, D. L. Kilb, and S. W. Roecker Directional Variations in Travel-Time Residuals of Teleseismic P Waves in the Crust and Mantle beneath Northern Tien Shan Bulletin of the Seismological Society of America, April 1, 2004; 94(2): 650 - 664. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Site Effect Analysis around the Seismically Induced Ananevo Rockslide, Kyrgyzstan Bulletin of the Seismological Society of America, December 1, 2002; 92(8): 3190 - 3209.
|
|
|
|
|
|
Paleoseismologic Evidence for a Very Large (Mw >7), Post-A.D. 1660 Surface Rupture on the Eastern San Cayetano Fault, Ventura County, California: Was This the Elusive Source of the Damaging 21 December 1812 Earthquake? Bulletin of the Seismological Society of America, December 1, 2001; 91(6): 1417 - 1432.
|
|
|
|
|
|
Paleoseismologic Evidence for a >8 Ka Age of the Most Recent Surface Rupture on the Eastern Sierra Madre Fault, Northern Los Angeles Metropolitan Region, California Bulletin of the Seismological Society of America, April 1, 2001; 91(2): 232 - 249.
|
|
|
|
|
|
V. G. Martynov, F. L. Vernon, R. J. Mellors, and G. L. Pavlis High-frequency attenuation in the crust and upper mantle of the northern Tien Shan Bulletin of the Seismological Society of America, February 1, 1999; 89(1): 215 - 238. [Abstract] [PDF]
|
|
|
|
|
|
R. H. Sibson and G. Xie Dip range for intracontinental reverse fault ruptures: Truth not stranger than friction? Bulletin of the Seismological Society of America, August 1, 1998; 88(4): 1014 - 1022. [Abstract] [PDF]
|
|
|
|
|
|
S. Ghose, R. J. Mellors, A. M. Korjenkov, M. W. Hamburger, T. L. Pavlis, G. L. Pavlis, M. Omuraliev, E. Mamyrov, and A. R. Muraliev The MS = 7.3 1992 Suusamyr, Kyrgyzstan, earthquake in the tien shan: 2. Aftershock focal mechanisms and surface deformation Bulletin of the Seismological Society of America, February 1, 1997; 87(1): 23 - 38. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
