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采用合成孔径雷达差分干涉测量技术对2008年5月12日四川汶川地震(Ms=8.0)的形变信息进行了提取,并开展了研究,利用地震前后ALOS/PALSAR数据,进行重复轨道差分干涉处理,得到了震前—震后的干涉条纹图和形变结果图。由雷达视向形变图可知,此次地震造成了隆起形变,最大形变出现在北川—映秀断裂带上,最大雷达视向形变量超过了90 cm,形变范围较大,川西的大部分地方都出现了不同程度的地表形变。结合川西的地质和地型构造情况,根据地震同震形变场的空间分布特征,对形变特征和震源构造进行了分析,发现二者有很好的一致性。
The deformation information of the Wenchuan earthquake (Ms = 8.0) in Sichuan Province on May 12, 2008 was extracted using the differential interferometry technique of synthetic aperture radar. A study was conducted on the deformation information of the Wenchuan earthquake (Ms = 8.0) on May 12, 2008. The pre- and post-earthquake ALOS / PALSAR data were used to perform the differential orbit interference treatment. The fringes and deformation results were obtained before and after the earthquake. According to the deformation map of the radar, the uplift deformation caused by the earthquake and the maximum deformation occurred in the Beichuan-Yingxiu fault zone, the maximum radar apparent deformation exceeds 90 cm and the deformation range is larger, and the majority of western Sichuan appear Different degrees of surface deformation. According to the geological and geomorphic structures in western Sichuan, according to the spatial distribution characteristics of the coseismic deformation field of the earthquake, the deformation characteristics and the source structure are analyzed and found to be in good agreement.