成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：199-211,13.DOI:10.12474/cdlgzrkx.2025011601
2025年1月7日西藏定日MS6.8级地震InSAR同震形变探测与断层滑动分布反演
InSAR coseismic deformation detection and fault slip distribution inversion of the MS 6.8 earthquake in Dingri,Tibet on January 7,2025
摘要
Abstract
An MS 6.8 earthquake occurred in Dingri County,Shigatse City,Tibet Autonomous Region on 7 January 2025,which is the largest earthquake to have occurred in recent years.The macro-earthquake epicenter was located near the Shenzha-Dingjie fault zone at the junction of the Tibetan Plateau and the Indian Plate.To understand the characteristics of this earthquake,we determined the coseismic deformation field of this earthquake based on InSAR technology,using the data from Lutan-1(ascending orbit)and Sentinel-1(descending orbit).These data were used to invert the sliding distribution of the seismic fault,and to calculate the coseismic coulombic stress changes at different depths in the region.The results show that the surface deformation caused by this earthquake is up to 160×100 km,and the deformation is concentrated on the west side of the Dengmecuo fault,with a maximum deformation of-1.538 m along the satellite's line of sight,and a maximum vertical deformation of 0.68 m.The inversion results show that the ruptured faults are mainly positively faulted,with a small amount of strike-slip,and the slips are mainly located in the range of 0～14 km below ground.The maximum amount of sliding is about 4.73 m.Based on a comprehensive evaluation of the inversion results and geological data,we find that the Dengmeco fault generated this earthquake.The columb stress change at different depths shows that the south Tibetan sliding disassemblage system fracture zone,the Shenzha-Dingjie fracture zone,and the central part of the Zhada-Lazi-Qiongduojiang fracture zone are all in the stress-loading zone,which need to be better understood and studied.关键词
定日地震/合成孔径雷达差分干涉测量/同震形变/断层滑动分布反演Key words
Dingri earthquake/differential interferometric synthetic aperture radar/coseismic deformation/slip distribution分类
测绘与仪器引用本文复制引用
李雨森,李为乐,许强,陆会燕,何国庆,范禄震,秦佳松..2025年1月7日西藏定日MS6.8级地震InSAR同震形变探测与断层滑动分布反演[J].成都理工大学学报（自然科学版）,2025,52(4):199-211,13.基金项目
国家社会科学基金重大项目(24&ZD164). （24&ZD164）
