西藏定日M_(S)6.8地震同震形变与地质灾害发育特征分析  

Characterization of co-seismic deformation and geological hazard development of Dingri M_(S)6.8 earthquake in Xizang

作　　者：张丽 李曼 刘斌 张玲 葛大庆 郭兆成 陈扬洋 万祥星 王宇 ZHANG Li;LI Man;LIU Bin;ZHANG Ling;GE Daqing;GUO Zhaocheng;CHEN Yangyang;WAN Xiangxing;WANG Yu(China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China;Technology Innovation Center for Geohazards Identification and Monitoring with Earth Observation System,Ministry of Natural Resources of the People’s Republic of China,Beijing 100083,China)

机构地区：[1]中国自然资源航空物探遥感中心,北京100083 [2]自然资源部地质灾害隐患遥感识别与监测工程技术创新中心,北京100083

出　　处：《安全与环境工程》2025年第2期1-13,共13页Safety and Environmental Engineering

基　　金：国家自然科学基金区域创新发展联合基金重点支持项目(U22A20569);中国地质调查项目(DD20230440)。

摘　　要：2025年1月7日9时西藏日喀则市定日县M_(S)6.8地震是一次发生在登么错断裂的正断层破裂过程。为圈定此次地震的形变影响范围,利用陆地探测一号(LuTan-1,LT-1)卫星、哨兵一号(Sentinel-1)卫星数据获取了完整的合成孔径雷达(InSAR)同震形变场,结合震前、同震和震后全时段InSAR结果分析地震诱发的典型地质灾害演化模式。结果表明:定日地震以登么错正断层破裂为主,兼左旋走滑运动;地震形变影响范围达24200 km^(2),视线向最大形变量超过2.6 m,方位向最大形变量超过1.2 m;通过融合InSAR形变结果和光学影像,并基于DEM(数字高程模型)数据,解译识别出震区变形斜坡单元3528处;地震的发生导致震区部分老滑坡重启、加速或产生新的崩滑灾害。本文通过综合遥感手段全面揭示了定日地震形变分布特点以及典型地震地质灾害发育特征,可有效支撑地震地质灾害灾后排查与科学防治。At 9:00 on January 7th,2025,a M_(S)6.8 earthquake occurred in Dingri County,Rikaze City,Xizang Autonomous Region.This earthquake was triggered by a normal fault rupture of the Dengmecuo fault.To delineate the range of earthquake-induced ground deformation,the complete interferometric synthetic aperture radar(InSAR)seismic deformation field was generated using LuTan-1(LT-1)and Sentinel-1 satellite data.The evolution patterns of typical earthquake-induced geological hazard were analyzed based on the full-time InSAR results from before the earthquake to after the earthquake.The results show that Dingri earthquake was dominated by the rupture of the Dengmecuo fault,accompanied by left-rotation strike-slip motion.The range of earthquake-induced deformation is about 24200 km^(2),and the maximum deformation in the line-of-sight direction is more than 2.6 m,and the maximum deformation in the azimuth direction exceeded 1.2 m.Besides,3528 deformed slope units were identified based on the interpretation of digital elevation model(DEM),InSAR derived deformation field,and optical images.The evolution patterns of typical earthquake-induced geological hazard were analyzed based on the full-time InSAR results from before the earthquake to after the earthquake,which include the reactivate and the accelerate of old landslides,and the activate of new landslides.This paper reveals the characteristics of deformation distribution of Dingri earthquake,and the evolution patterns of typical geological hazard triggered by the earthquake,which can effectively support the prevention and mitigation of earthquake-induced geological hazard.

关 键 词：定日地震 同震形变场 形变斜坡 典型地质灾害 

分 类 号：X43[环境科学与工程—灾害防治] P237[天文地球—摄影测量与遥感]