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《Chinese Journal of Geophysics》 2008-04
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Coseismic slip distribution of the 2001 Kunlun mountain pass west earthquake constrained using GPS and InSAR data

WAN Yong-Ge~(1,2) SHEN Zheng-Kang~(2,3) WANG Min~4 ZHANG Zu-Sheng~5 GAN Wei-Jun~2 WANG Qing-Liang~6 SHENG Shu-Zhong~1 1 State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China 2 Institute of Disaster Prevention Science and Technology,Yanjiao,Beijing 101601,China 3 Department of Earth and Space Sciences,University of California,Los Angeles,CA 90095-1567,USA 4 Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China 5 First Monitoring Center of China Earthquake Administration,Tianjin 300180,China 6 Second Monitoring Center of China Earthquake Administration,Xi'an 710054,China  
The rupture process of the 2001 Ms 8.1 Kunlun Mountain Pass west earthquake was quite complex.Studies on its coseismic rupture distribution using different datasets,methods, and models have so far produced rather different results.We use coseismic displacement data obtained from the Global Positioning System(GPS)and Interferometric Synthetic Aperture Radar(InSAR)measurements made before and after the earthquake to invert for its rupture distribution.We test multiple model parameters,and provide a more detailed result than previous studies under an optimized smoothing constraint.The modeling process consists of three steps: First,assuming a vertical fault plane we obtain an optimal smoothing constraint for the solution based on balancing a trade-off between the solution resolution and model misfit.Second,we vary dipping angles of fault segments to search for optimal dipping angles in data fitting.Finally,we adopt the fault smoothing constraint and dipping angles obtained from previous two steps and invert for the coseismic rupture distribution.Comparing with previous studies,our results agree better with the field survey results on horizontal surface offsets.We also find that the coseismic displacement amplitudes are asymmetric across the seismic fault,with the displacements south of the fault about 10%~20% larger in amplitude than that north of the fault.This observation can be explained by the fault dipping 80°~81°to the south.We also demonstrate the first time that a left step of about 50 km length located between the west end of the rupture on the East Kunlun fault and the east end of the Sun Lake fault absorbed 0.1~0.2 m of normal faulting,and the Kunlun Pass fault absorbed about 0.8 m thrust faulting.The seismic moment release is estimated 9.3×10~(20)N·m,corresponding to a M_w 8.0 earthquake.
【Fund】: 国家自然科学基金(40334042,40374012);; 地震科学联合基金(105003)资助
【CateGory Index】: P315
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