九寨沟Ms7.0地震的同震形变场误差研究及断层滑动分布反演

北京时间2017年8月8日四川省九寨沟发生Ms7.0级地震。为了提高断层滑动分布反演的可靠性,本文利用升降轨InSAR数据联合反演断层滑动分布,再根据模拟形变值二次反演,对比反演结果来探讨升降轨形变场误差和确定断层滑动分布的结果。结果表明,九寨沟升轨同震形变场的质量较好,降轨形变场受余震、震后粘弹性松弛效应影响明显,利用模拟形变值二次反演确定的断层滑动分布可靠性更高。

Study on Error of Coseismic Deformation Field and Inversion of Fault Slip Distribution of the Jiuzhaigou Ms7.0 Earthquake

An Ms7.0 earthquake occurred in Jiuzhaigou,Sichuan Province on August 8th 2017. In order to improve the the reliability of fault slip distribution inversion,the fault slip distribution was inversed by using the InSAR data of ascending and descending orbit.Re-inversion was carried out acording to the simulated inversion result subsequently. The error of deformation field was discussed and the result of fault slip distribution was confirmed by comparing the inversion results. The results suggest that the quality of the coseismic deformation field of ascending orbit in Jiuzhaigou is high,in comparison with that the deformation field of descending orbit is affected obviously by aftershocks and the postseismic viscoelasitic deformation. The reliability of fault slip distribution determined by quadratic inversion according to simulated deformation value is higher.