【摘要】 以2008年5月12日发生在中国四川的Mw 7.9级汶川地震为研究对象,由于汶川地震发生在植被覆盖茂密、地形起伏大的龙门山山区,常规的C波段雷达在这些区域几乎得不到任何有意义的信号,采用日本JAXA的L波段ALOS/PALSAR覆盖震区的震前和震后6个条带的卫星数据,以SRTM-DEM数据作为外部DEM,利用GAMMA软件进行二通差分干涉测量处理,获取了覆盖震区的同震形变场;并使用国家重大科学工程"中国地壳运动观测网络"项目组公布的震区GPS同震观测结果,与InSAR观测结果进行了比较分析,表明两者之间具有很好的一致性,通过传统差分干涉获取到的形变量精度可以达到cm级。更多还原

【Abstract】 On 12 May 2008,a Mw 7.9 Wenchuan Earthquake occurred in Sichuan Province,China,which is located in Longmenshan mountain area with bald relief and dense vegetation.The smaller wavelength(C-band) system can not provide high quality interferograms.In order to map co-seismic deformation in earthquake region,the SAR data collected by L band ALOS/PALSAR sensor of JAXA are used in the study,including before and after the quake from six paths.A two-pass differential InSAR technology and external DEM acquired by SRTM mission are employed in GAMMA software to generate the co-seismic deformation field.GPS observation results of co-seismic deformation surveyed by Chinese national large scientific project-Crustal Movement Observation Network of China(CMONC) project team are used to evaluate the InSAR observations.The result shows that there is a high consistent between GPS and InSAR observations.And accuracy of line of sight surface displacement derived from traditional InSAR technique can achieve cm-level.更多还原