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
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
摘要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.
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.
基金资助: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)
通讯作者:
Bin Liu
E-mail: lbin0226@163.com
引用本文:
Bin Liu, Wenliang Jiang, Jingfa Zhang, Yi Luo, Lixia Gong. Wenchuan earthquake ruptures located by offset-tracking procedure of ENVISAT ASAR amplitude images[J]. 《地震学报》英文版, 2010, 23(3): 283-287.
Bin Liu, Wenliang Jiang, Jingfa Zhang, Yi Luo, Lixia Gong. Wenchuan earthquake ruptures located by offset-tracking procedure of ENVISAT ASAR amplitude images. Earthquake Science, 2010, 23(3): 283-287.
