升降轨道ASAR雷达干涉揭示的巴姆地震（Mw6．5）3D同震形变场

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。

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

We processed the ascending and descending pass ASAR radar data that covers the same area using 2-pass D-INSAR 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 INSAR 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-fault model is unnecessary.