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Wenchuan earthquake ruptures located by offset-tracking procedure of ENVISAT ASAR amplitude images |
Bin Liu1, 2, Wenliang Jiang2, Jingfa Zhang2, Yi Luo2, Lixia Gong2 |
1 Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
2 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China |
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Abstract Two rupture zones of Wenchuan earthquake have been successfully located by an offset-tracking procedure of ENVISAT ASAR amplitude images. Accuracy of offset-tracking strongly depends on the quality of image coregistration. In order to remove noise caused by coregistration, a combined filter method is proposed to remove noise of estimated offsets. In addition, Kriging interpolation is applied to smooth the azimuth displacement offset map. The displacement offset maps of azimuth and range show that about 245 km and 60 km in length along Beichuan-Yingxiu fault and Guanxian-Jiangyou fault were ruptured by Wenchuan earthquake, respectively. The result of offset-tracking is validated by field observations of China Earthquake Administration.
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Received: 15 March 2010
Published: 10 June 2010
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Fund:the Special Item of Professional Fund for Basic Scientific Research of Chinese Central-Level Public-Welfare College/Institute from Chinese Finance Department (ZDJ2009-36), National Natural Science Foundation of China (40774023), National 863 Program of China (2006AA12Z150), and the project Dragon 2 (5343) |
Corresponding Authors:
Bin Liu
E-mail: lbin0226@163.com
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[1] |
Yu Wang, Shengli Ma, Toshihiko Shimamoto, Lu Yao, Jianye Chen, Xiaosong Yang, Honglin He, Jiaxiang Dang, Linfeng Hou, Tetsuhiro Togo. Internal structures and high-velocity frictional properties of Longmenshan fault zone at Shenxigou activated during the 2008 Wenchuan earthquake[J]. Earthquake Science, 2014, 27(5): 499-528. |
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