巴姆地震三维形变场获取

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(differenti-al 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.

Acquisition of Three Dimensional Deformation Field of Bam Earthquake

Based on ASAR data covering Bam earthquake, D-InSAR method is used to obtain LOS direction coseismic deformation field. Aiming at the problems of incoherence and terrain error in deformation field, support vector regression method (SVR) is used to recover the incoherence, and a function model is established based on the latitude and longitude of deformation field and DEM to remove the residual terrain error, so as to obtain the complete deformation field. The three dimensional deformation field of Bam earthquake is obtained by a method of combining multiple InSAR technologies. The 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.