基于GPS和SBAS-InSAR的阳原盆地北缘断裂现今地表形变特征

基于2009~2017年阳原盆地及周边区域GPS观测数据和2017~2019年升、降轨Sentinel-1卫星SAR图像，使用SBAS-InSAR技术精确反演阳原盆地北缘断裂现今地表形变速率场。统计跨断层剖面线上指定间隔点的垂直滑动速率得出，阳原盆地北缘断裂东段、中段和西段两侧垂直滑动速率差值分别约为1.04 mm/a、1.43 mm/a和0.72 mm/a。右所堡-松枝口断裂的左旋走滑运动特征和该断裂与阳原盆地北缘断裂中段空间分布上呈交切关系是导致阳原盆地北缘断裂中段断层活动水平高于东段的主要原因，阳原盆地北缘断裂西段活动性不明显。GPS资料显示，阳原盆地北缘断裂在水平方向上具有右旋走滑运动特征。

The Current Surface Deformation Characteristics of Northern Margin Fault of Yangyuan Basin Based on GPS and SBAS-InSAR

Based on GPS data from 2009 to 2017 and Sentinel-1 SAR images including ascending and descending data acquired from 2017 to 2019, we use SBAS-InSAR to inverse the current surface deformation rate field of the northern margin fault of Yangyuan basin. According to the statistics of the vertical sliding rate of the designated interval points on the cross fault section line, the vertical sliding rate with two sides of the east, middle and west sections of the fault in the northern margin of Yangyuan basin are about 1.04 mm/a, 1.43 mm/a and 0.72 mm/a, respectively. The left lateral strike slip movement characteristics of Yousuobao-Songzhikou fault and the intersecting relationship between the fault and the middle segment of the fault in the northern margin of Yangyuan basin are the main reasons for the higher fault activity level in the middle segment of the fault in the northern margin of Yangyuan basin than in the eastern segment, while the activity of the western segment of the fault in the northern margin of Yangyuan basin is not obvious. GPS data show that the fault in the northern margin of Yangyuan basin is characterized by dextral strike slip movement in horizontal direction.