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《Earthquake》 2009-04
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Characteristics of Coseismic Deformation of the 2008 Gaize,Tibet Earthquake Based on D-InSAR Technology

HONG Shun-ying1,2,SHEN Xu-hui1,SHAN Xin-jian2LIU Zhi-rong3,DAI Ya-qiong2,JING Feng1,4 (1.Institute of Geology,CEA,Beijing 100029,China;2.Institute of Earthquake Science,CEA,Beijing 100036,China;3.Institute of Disaster-Prevention Science and Technology,East Suburb of Beijing 101601,China;4.Institute of Remote Sensing Applications,CAS,Beijing 100101,China)  
On 9 January,2008,an MS6.9 earthquake happened in Gaize region(Tibet),with an MS6.0 aftershock on 16 January,it is a typical double-earthquake.This paper uses the ESA ASAR SLC data to analyse the coseismic deformation characteristics of the Gaize earthquake by the Differential Interferometric Synthetic Aperture Radar(D-InSAR).The analysis indicate that the interferogram is dual-shell shape,about 33 km×30 km in extension.And it is divided into two parts by the NE-direction earthquake rupture,the northwest slant range subsides and the southeast slant range ascends.The max slant range change subsides about 53.2 cm,the max slant range change ascends about 11.3 cm.There are two deformation centers at the northwest subside part.It is speculated that the west deformation center is controlled by the MS6.0 aftershock,and the east deformation center is controlled by the MS6.9 earthquake.The macroscopical seismic center is located at the apart position(left step) of Laevo strike slip fault of Gaize-Dongcuo fault and Yibuchaka-Riganpeicuo fault,the tensile stress of this apart position leads to the typical normal fault fracture of the Gaize earthquake,and this accords with the interferogram characteristics and the Harvard mechanism.
【Fund】: 国家科技支撑计划课题(2008BAC35B04-4);; 中国地震局地震预测研究所基本科研项目(0207690224 0207690207);; 中国地震局地震科学联合基金(C07007)联合资助
【CateGory Index】: P315.7
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