联合光学和雷达遥感数据的2021年玛多M_(W)7.3地震同震形变提取

Coseismic Deformation Extraction of 2021 Maduo M_(W)7.3 Earthquake Based on Combined Optical and Radar Remote Sensing Data

利用Sentinel-1升降轨数据,基于D-InSAR技术获取2021-05-22青海玛多M_(W)7.3地震LOS向形变场。由于地震破裂达到地表,沿断层剖面处出现了干涉条纹不连续、破碎重叠等现象,为准确提取地震发震断层的几何展布,联合地震前后的Landsat-8光学影像数据,基于频率域互相关算法提取地震水平向形变场及断层的几何展布特征。结果显示,玛多地震的地表破裂轨迹长达155.6 km,在首端及末端存在分支破裂,地表主体破裂带可分为3段,段间走向差异较大,整体呈NWW向展布。发震断层主要以左旋走滑为主,推测本次地震由昆仑山口-江错断裂控制。

Using Sentinel-1 ascending and descending data and D-InSAR technology, we obtain the LOS deformation field of May 22, 2021 Maduo, Qinghai, M_(W)7.3 earthquake. As the earthquake rupture reaches the surface, the interference fringes along the fault section are discontinuous, broken and overlapping. In order to accurately extract the geometric distribution of the seismogenic fault of the earthquake, combined with the Landsat-8 optical image data before and after the earthquake, we extract the horizontal deformation field and geometric distribution characteristics of the Maduo earthquake based on the frequency domain cross-correlation algorithm. The results show that the surface fracture track of the earthquake is 155.6 km, and there are branch fractures at the head and end. The main surface fracture zone can be divided into three segments, with great differences in strike between each segment. Its overall distribution is NWW. The seismogenic fault is mainly sinistral strike slip. It is speculated that this earthquake is controlled by the Kunlunshankou-Jiangcuo fault.