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.
出处
《遥感学报》
EI
CSCD
北大核心
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)
关键词
雷达干涉
同震形变
隐伏断层
视线向模糊
SAB interferometry
co-seismic deformation
build fault
LOS ambiguity
