利用覆盖九寨沟M_S7.0地震的Sentinel-1升、降轨和Radarsat-2升轨数据,分别提取了3个轨道沿雷达视线向形变,运用多平台联合观测方法解算了九寨沟地震沿地表真实的垂直向、SN向和EW向形变信息。结果表明,3个轨道InSAR数据均监测到了LOS向同震形变,范围约55km×45km,呈“果仁状”,靠近卫星飞行方向最大形变量为12.9cm (降轨),远离卫星飞行方向最大形变量为19.5cm (升轨)。三维形变结果显示,垂直向上位移达23.4cm,垂直向下位移达17.6cm;北向位移达141.8cm,南向位移达100.2cm;东向位移达22.0cm,西向位移达10.7cm。树正断裂两端地块呈非对称水平相对运动,上盘单侧向东形变较剧烈,符合左旋走滑型地震事件的运动特征。

Using Sentinel-1 ascending,descending and Radarsat-2 dataset covering the Jiuzhaigou earthquake,the deformations along los direction of three orbits were extracted respectively,and the true vertical,north-south and east-west deformations along the surface of Jiuzhaigou earthquake was calculated by using multi platform joint observation method. The results show that the three orbital InSAR data have detected coseismic deformation along LOS direction,with a range of about 55km×45km,in a "nut-like shape",and the largest deformation in the direction of flight close to the satellite is 12.9cm(descending orbit),while flying away from the satellite the maximum deformation is 19.5cm(ascending track).The 3D deformation results show that the displacement reaches 23.4cm in the vertical upward,17.6cm in the vertical downward reaches,141.8cm in the north displacement,100.2cm in the south displacement,22.0cm in the east displacement,and 10.7cm in the west displacement. The blocks at both ends of the Shuzheng fault move asymmetrically and horizontally,and the hanging wall deforms more violently to the east from one side,which is consistent with the movement characteristics of a left-lateral strike-slip earthquake event.

P315

中国地震局“三结合”课题(3JH-202001114)、国家重点研发计划(2018YFC1503606)和北京市自然科学基金(8204077)共同资助