基于合成孔径雷达差分干涉测量的基本原理,利用地震前后的ERS-1/2的三景数据,获取了1998年1月10日张北地震(Ms=6.2级)的同震干涉纹图.这种差分干涉纹图能表现地震断层和形变场的同震形变特征,而且该方法无需任何的辅助信息,适用于大范围的地震监测与研究.研究表明,通过合成孔径雷达差分干涉测量技术能够获取高精度的强震同震位移场数据,这是传统的地面观测方法所无法做到的.

It is possible to map a coseismic displacement field resulting from a major earthquake by differential SAR intereferometry and to achieve results comparable in magnitude to those obtained by conventional field survey techniques. Here we use differential SAR interferometry to capture the movements produced by the 1998 earthquake (Ms=6.2) in Zhangbei, Hebei province. Three interferograms constructed from ESR-1/2 SAR data were used to analyze the earthquake mechanism by three-pass method. The differential interferogram reveals fine geometrical features and seismic fault. Since we require only remotely sensed satellite data with no additional requirements for ancillary information, the technique is well suited for wide range seismic monitoring and analysis.