Wen, Yi-Ying and Ma, Kuo-Fong and Song, Teh-Ru Alex and Mooney, Walter D. (2009) Validation of the rupture properties of the 2001 Kunlun, China (M_s=8.1), earthquake from seismological and geological observations. Geophysical Journal International, 177 (2). pp. 555-570. ISSN 0956-540X http://resolver.caltech.edu/CaltechAUTHORS:20090624-101148435
- Published Version
Restricted to Repository administrators only
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20090624-101148435
We determine the finite-fault slip distribution of the 2001 Kunlun earthquake (M_s = 8.1) by inverting teleseismic waveforms, as constrained by geological and remote sensing field observations. The spatial slip distribution along the 400-km-long fault was divided into five segments in accordance with geological observations. Forward modelling of regional surface waves was performed to estimate the variation of the speed of rupture propagation during faulting. For our modelling, the regional 1-D velocity structure was carefully constructed for each of six regional seismic stations using three events with magnitudes of 5.1–5.4 distributed along the ruptured portion of the Kunlun fault. Our result shows that the average rupture velocity is about 3.6 km s^−1, consistent with teleseismic long period wave modelling. The initial rupture was almost purely strike-slip with a rupture velocity of 1.9 km s^−1, increasing to 3.5 km s^−1 in the second fault segment, and reaching a rupture velocity of about 6 km s^−1 in the third segment and the fourth segment, where the maximum surface offset, with a broad fault zone, was observed. The rupture velocity decelerated to a value of 3.3 km s^−1 in the fifth and final segment. Coseismic slip on the fault was concentrated between the surface and a depth of about 10 km. We infer that significant variations in rupture velocity and the observed fault segmentation are indicative of variations in strength along the interface of the Kunlun fault, as well as variations in fault geometry.
|Additional Information:||© 2009 The Authors. Journal compilation © 2009 RAS. Accepted 2008 October 31. Received 2008 October 31; in original form 2008 April 30. Published Online: 24 March 2009. We appreciate the help and discussion from Xiwei Xu and Jin Zhang at Institute of Geology, China Earthquake Administration, Beijing, China to improve this manuscript. The manuscript was improved by thorough peer reviews of Martin Vallee, an anonymous reviewer, and the editor, Massimo Cocco. This research was supported by the Taiwan Earthquake Center (TEC) funded through National Science Council (NSC97–2745-M-008–013) with TEC contribution number 00018.|
|Subject Keywords:||Satellite geodesy; Earthquake source observations; Dynamics and mechanics of faulting|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||13 Aug 2009 15:02|
|Last Modified:||26 Dec 2012 11:03|
Repository Staff Only: item control page