2021年漾濞MW6.1地震同震形变提取与断层源模型反演研究

基于D-InSAR技术，收集Sentinel-1卫星升、降轨及精密轨道数据，结合外部DEM，成功提取2021-05-21云南省大理州漾濞县M_W6.1地震的同震形变场。结果显示，升轨卫星视线向最大形变量级约为6.0 cm，降轨卫星视线向最大形变量级约为7.9 cm。以升、降轨InSAR观测结果为约束，对漾濞地震的断层几何参数及滑动分布进行联合反演发现，此次地震的最优发震断层走向为136.6°、倾角为83.1°，断层破裂主要集中在地下2~12 km深度处，最大滑动量约为0.45 m，位于地下7 km深度处，断层在近地表未出现大面积显著滑移现象，表明此次地震未破裂至地表。

Research of the Coseismic Deformation Extraction and Fault Source Model Inversion of Yangbi MW6.1 Earthquake in 2021

Based on D-InSAR technique, the coseismic deformation fields of the May 21, 2021 M_W6.1 earthquake in Yangbi County, Dali Prefecture, Yunnan Province are successfully extracted by collecting Sentinel-1 satellite ascending and descending orbit data and precision orbit data, combined with external DEM data.The results show that the maximum line-of-sight deformation of the ascending is about 6.0 cm while the descending about 7.9 cm. Based on InSAR observations, we obtain the fault geometry parameters and slip distribution of the Yangbi earthquake. We find that the fault of the earthquake has an optimal strike angle of 136.6° and dip angle of 83.1°. The fault rupture is mainly concentrated in the depth of 2 to 12 km underground. The maximum slip is about 0.45 m, located at a depth of about 7 km underground. There is no large area significant slip near the surface of the fault, indicating that the earthquake did not rupture to the surface.