Research Papers

Coseismic displacement field of the Wenchuan Ms 8.0 earthquake in 2008 derived using differential radar interferometry

[+] Author Affiliations
Chunyan Qu, Xinjian Shan, Guohong Zhang, Xiaogang Song, Guifang Zhang

State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Dewai Qijiahuozi, Beijing 100029 China

J. Appl. Remote Sens. 4(1), 043516 (March 19, 2010). doi:10.1117/1.3386043
History: Received July 18, 2009; Revised February 19, 2010; Accepted March 11, 2010; March 19, 2010; Online March 19, 2010
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Abstract

We used the radar data from satellite ALOS/PALSAR of Japan and D-InSAR technology to derive the coseismic displacement produced by the Wenchuan, China Ms 8.0 earthquake on 12 May 2008. The result shows that the coseismic displacement primarily concentrated in a near-field range about 100km width on both sides of the Yingxiu-Beichuan fault. The incoherent zone about 250km long and 15~35km wide nearby the fault suffered the largest deformation with surface ruptures. The secondary deformed areas are 70km wide on each side of the incoherent zone, where the displacements exhibit a sunk northern wall with maximum -110~120cm and an uplifted southern wall with maximum 120~130cm, respectively. In the far-field range of the fault, displacements are less than 10cm. Using the offset tracking, we found clear rupture traces and coseismic displacement of 3m along the faults. With a model of four fault sections, we retrieved slip distribution on the faults. The inversion result reveals two slips of 10m at depths 5~20km beneath the Yingxiu-Beichuan fault and one slip of 2.3m at depth 5~20km below the Guanxian-Jiangyou fault, respectively. Thrust faulting dominates the southwestern Yingxiu-Beichuan fault and the entire Guanxian-Jiangyou fault, while right-slip is the primary component along the northeastern Yingxiu-Beichuan fault.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Chunyan Qu ; Xinjian Shan ; Guohong Zhang ; Xiaogang Song and Guifang Zhang
"Coseismic displacement field of the Wenchuan Ms 8.0 earthquake in 2008 derived using differential radar interferometry", J. Appl. Remote Sens. 4(1), 043516 (March 19, 2010). ; http://dx.doi.org/10.1117/1.3386043


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