中国玉树Mw6.9地震InSAR地表形变特征分析

英文篇名：CHARACTERISTIC ANALYSIS OF COSEISMIC DEFORMATION OF YUSHU Mw6.9 EARTHQUAKE FROM InSAR IMAGES
中文刊名：大地测量与地球动力学
英文刊名：Journal of Geodesy and Geodynamics
作者：沈强 ; 乔学军 ; 王琪 ; 张景发 ; 谭凯 ; 杨少敏
英文作者：Shen Qiang1) ; Qiao Xuejun1) ; Wang Qi1) ; Zhang Jingfa2) ; Tan Kai1) and Yang Shaomin1)1)Institute of Seismology ; CEA ; Wuhan 4300712)Institute of Crustal Dynamics ; CEA ; Beijing 100085
中文关键词：玉树地区 ; Mw6.9地震 ; InSAR ; 地表形变 ; 断层
英文关键词：Yushu area ; Mw6.9 earthquake ; InSAR ; surface displacement ; fault
出版日期：2010-06-15
机构：中国地震局地震研究所;中国地震局地壳应力研究所;
年：2010
期：03
出版单位：大地测量与地球动力学

摘要

利用ALOS PALSAR和ENVISATASAR雷达遥感干涉像对,获取了2010年4月14日玉树Mw6.9地震的InSAR同震形变场。对形变结果的分析表明:至少有3次地表破裂;沿断层走向的形变分布范围远大于垂直断层分布范围,且对断层两侧的影响范围在10 km左右;最大的视线向形变量达54 cm,最大水平位移达180 cm;形变分布特征与左旋走滑断层特征吻合。对比ALOS PALSAR和ENVISAT ASAR的形变测量结果,发现两种模式获取的结果非常一致。另外基于InSAR获取的宏观震中与野外考察结果也非常一致,表明InSAR是宏观震中快速定位的简单快捷方法。
The coseismic surface deformation information of Yushu earthquake on April 14,2010 is firstly extracted by using ALOS PALSAR and ENVISAT ASAR based on interferometry technique.Analysis of displacement fields shows that there were surface ruptures three times,at least,the deformation along the fault was much larger than that of the perpendicular,where the effect is in range of 10 km.Maximum displacement reaches 54 cm in line of sight,180 cm in horizontal deriction.Deformation distributions and characteristics are very consistent with that of sinistral strike slip.The consistency is found between the two results from ALOS PALSAR and ENVISAT ASAR separately.In addition,the location of macro-epicenter derived from InSAR very close to that from field investigation.It means that InSAR is a simple and quick means to locate macro-epicenter of an earthquake.

引文

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