利用Sentinel-1A数据、D-InSAR和沿轨干涉技术获取2016年高雄MS6.7地震三维形变场

提出一种沿轨干涉技术来获取Sentinel-1A数据中burst重叠区域内的方位向形变，进而通过内插方法得到非重叠区的方位向形变。针对D-InSAR的雷达视线向形变与沿轨干涉的方位向形变精度差异，采用基于加权最小二乘的方法解算了2016年高雄MS6.7地震的三维形变场。结果表明，高雄地震的同震形变以垂直和东西方向形变为主，且形变主要分布在断层左右两瓣。左瓣抬升，最大达到12 cm；右瓣下沉，最大达到8 cm；左右两瓣均伴随着向西的位移，最大达6 cm。在左右两瓣之间，该地震还具有西北-东南走向的断层特性。

3D Displacement Field of 2016 Kaohsiung Ms6.7 Earthquake from D-InSAR and Along-Track Interferometry with Ascending and Descending Sentinel-1A Images

‘Along-track interferometry’method is proposed to obtain along-track displacements from backward and forward interferograms within regions of burst overlap. The azimuth direction displacement component of non-overlap area is measured by interpolation. The experimental results show that the coseismic displacement of the Kaohsiung earthquake is predominantly vertical and east-west direction, and mainly distributes in left and right valves of a blind fault. The left valve uplifts with a maximum vertical displacement of 12 cm, and the right valve drops with a maximum vertical displacement of 8 cm. Meanwhile, they have a displacement westward, to a maximum of up to 6 cm. In addition, the Kaohsiung earthquake has a characteristic of northwest-southeast trend blind fault between the left and right valve.