昆仑山口西8.1级大地震震后库赛湖地区多时相InSAR地表形变遥感探测

利用2003年~2007年间14景欧空局ENVISAT ASAR卫星数据,结合SRTM DEM数据,采用多时相SAR协同配准方法进行二路干涉处理,对2001年11月昆仑山口西8.1级大地震宏观震中—库赛湖地区的地表形变场进行了多时相探测。结果表明:①多时相InSAR技术能够对位于高海拔山区的东昆仑断裂带库赛湖段的地表形变实施连续监测;②震后发震断裂带的调整活动经历了一个动态变化的过程,2003年~2004年、2005年9月至2006年2月相对活跃,调整幅度较大,2004年11月至2005年9月间调整较小;③2006年~2007年发震断裂带地区活动逐渐减弱。

Remote Sensing of Post-seismic Surface Deformation in Kusai Lake Region After the 2001 Ms 8.1 Kunlun Earthquake Using Multi-temporal InSAR Data

14 scenes of ENVISAT ASAR data acquired from 2003 to 2007 are adopted in this research to study the post-seismic surface deformation in Kusai Lake region after the 2001 Ms 8.1 Kunlun earthquake.SRTM DEM data are included and the cooperative SAR image registration method is used for pre-processing of multi-temporal ASAR data in later two-pass differential InSAR pairs.The results showed that:(1)cooperative registering multi-temporal InSAR is an efficient tool for continuous surface deformation detection in this area.(2)The post-seismic deformation adjustment of the rupture belt is a dynamic process.During the period of 2003,2004 and from Sep.2005 to Feb.2006,the amplitude of adjustment was large.The rupture belt was relatively stable during the period from Nov.2004 to Sep.2005.(3)In 2006 and 2007,the adjustment was weakening gradually.