多视角InSAR数据解算2017两伊地震三维同震形变场

Calculation three-dimensional co-seismic deformation of the 2017 Iran-Iraq earthquake by multi-angle InSAR data

2017两伊地震是自1900年以来发生在扎格罗斯山脉的最大地震,为了研究此次地震引起的同震形变场,利用覆盖同一地区的3对Sentinel-1A升降轨数据分别进行两通差分DInSAR处理,得到了研究区3个视线向的地表同震形变场,通过直接解算法重建了研究区的三维同震形变场。试验表明:3种视角的升降轨视线向上升与沉降总体趋势基本一致;联合多个视角的观测结果可以实现三维形变场的重建;根据地表视线向和三维同震形变的特征以及地质构造背景推测了发震断层很有可能为扎格罗斯山前断层。

The 2017 Iran-Iraq earthquake is the largest earthquake in zagros mountains since 1900.In order to study the coseismic deformation field caused by the earthquake,two-pass differential DInSAR processing is carried out using three pairs of Sentinel-1A elevation track data covering the same area,and the three-dimensional coseismic deformation field of the study area is reconstructed by direct solution algorithm.The experiment shows that the elevation track line of sight of the three perspectives is basically consistent with the settlement trend.The reconstruction of 3D deformation field can be realized by combining the observation results from multiple perspectives.According to the characteristics of surface line of sight and three-dimensional coseismic deformation and geological structure background,it is speculated that the seismogenic fault is likely to be Zagros piedmont fault.