升降轨道ASAR雷达干涉揭示的巴姆地震(Mw6.5)3D同震形变场  

3D Co-seismic Deformation Field of the Bam Earthquake(Mw6.5) from Ascending and Descending Pass ASAR Radar Interferometry

作　　者：孙建宝[1] 梁芳[2] 徐锡伟[3] 宫鹏[1] 

机构地区：[1]北京师范大学资源学院,北京100875 [2]北京市地震局,北京100080 [3]中国地震局地质研究所,北京100029

出　　处：《遥感学报》2006年第4期489-496,共8页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家863计划项目(编号:2005AA132031XZ06);国家科技基础条件平台重点项目(编号:2003DIA6N005)

摘　　要：通过对覆盖同一地区的升降轨道ASAR雷达数据进行两路差分干涉(D-INSAR)处理,得到了2003年12月26日伊朗巴姆(Bam)地震(Mw6.5)在两种成像几何状态下的视线向(LOS)同震形变场。利用Okada弹性形变模型对形变场进行正演计算,得到地震断层的几何参数及形变的南北向分量。对得到的干涉条纹图进行相位解绕处理,综合分析两种不同的雷达成像几何关系,并利用模型估计得到的南北向分量,计算了该地震造成的3D同震形变场,结果显示了典型的单断层右旋走滑活动特征。研究表明,合并升降轨道雷达数据,能够为形变模型提供有效约束,用一条简化的断层模型就可以解释升降两条轨能的干涉形变场,更为复杂的双断层模型是不必要的。We processed the ascending and descending pass ASAB radar data that covers the same area using 2-pass D-INSAB technology, and got the co-seismic deformation field in LOS direction of the Bam（ Iran ） earthquake（Mw6.5） , which happened on Dec 26,2003, with two kinds of imaging geometry. After forward modeling of the co-seismic INSAB results using Okada＇ s elastic model in half-space, we got the geometric parameters of the seismic fault and the north-south component of the deformation field. We unwrapped the interferometric phase and computed its 3D co-seismic deformation field by combining the two kinds of imaging geometry and the north-south component from Okada＇s model. The 3D deformation field shows typical characteristics of single right-lateral strike-slip fault. The research also shows that integration of ascending and descending pass radar data could provide effective constraints for deformation models. The Bam Co-seismic deformation field could be interpreted by the simplified 1-fault model, therefore the complex 2-fauh model is unnecessary.

关 键 词：雷达干涉 同震形变 隐伏断层 视线向模糊 

分 类 号：TN959[电子电信—信号与信息处理] TP79[电子电信—信息与通信工程]