巴姆地震三维形变场获取  

Acquisition of Three Dimensional Deformation Field of Bam Earthquake

作　　者：张庆云 张景发 李永生 李兵权 罗三明[1] 马庆尊[1] ZHANG Qing-yun;ZHANG Jing-fa;LI Yong-sheng;LI Bing-quan;LUO San-ming;MA Qing-zun(The First Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China;National Institute of Natural Hazards,Ministry of Emergency Management of the People's Republic of China,Beijing 100085,China)

机构地区：[1]中国地震局第一监测中心,天津300180 [2]应急管理部国家自然灾害防治研究院,北京100085

出　　处：《科学技术与工程》2021年第6期2179-2185,共7页Science Technology and Engineering

基　　金：天津市自然科学基金(20JCQNJC01360);国家自然科学基金(41704051);中央级公益性科研院所基本科研业务专项(ZDJ2018-16);中国地震局“监测、预报、科研”三结合课题(3JH-202001103)。

摘　　要：基于覆盖巴姆地震的先进合成孔径雷达(advanced synthetic aperture radar,ASAR)数据,使用差分干涉测量(differential interferometric synthetic aperture radar,D-InSAR)方法获取卫星视线向(line of sight,LOS)向同震形变场,针对形变场中存在的失相干和地形误差等问题,分别使用非线性支持向量机方法(support vector regression,SVR)进行失相干恢复;并基于形变场经纬度与数字地形高程模型(digital elevation model,DEM)建立函数模型,去除残余的地形误差,从而获取完整的形变场。使用多种干涉雷达(interferometric synthetic aperture radar,InSAR)技术联合的方法获取巴姆地震的三维形变场。结果表明:SVR方法可以较好地恢复失相干区域,而且巴姆地震发震构造是近南北向断层,主要以右旋走滑运动为主。Based on advanced synthetic aperture radar(ASAR)data covering Bam earthquake,differential interferometric synthetic aperture radar(D-InSAR)method was used to obtain line of sight(LOS)direction coseismic deformation field.Aiming at solving the problems of incoherence and terrain error in deformation field,support vector regression method(SVR)was used to recover the incoherence,and a function model was established based on the latitude and longitude of deformation field and digital elevation model(DEM)to remove the residual terrain error,so as to obtain the complete deformation field.The three dimensional deformation field of Bam earthquake was obtained by a method of combining multiple interferometric synthetic aperture radar(InSAR)technologies.Results show that the SVR method can recover the decoherence area well,and the seismogenic structure of Bam earthquake is a nearly north-south fault,which is dominated by right-handed strike slip movement.

关 键 词：失相干 地形误差 三维形变场解算 巴姆地震 

分 类 号：P315.63[天文地球—地震学]