2025年1月7日西藏定日Ms6.8级强震地表同震形变特征与房屋建筑震损分析

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Coseismic deformation and seismic damage assessment of buildings from the 6.8 earthquake in Dingri， Xizang， on January 7， 2025

TAN Shasha’，YANG Yinghui'，XU Qiang'，WANG Yunsheng1，ZHAO Weihua’， LUO Yonghong’，CHEN Qiang2，JI Feng' 1.State Key LaboratoryofGeohazard Prevention and Geoenvironment Protection， Chengdu University of Technology， Chengdu 610059，China； 2.SouthwestJotongUniversityDepartmentofRemoteSnsingandInformationEngineeing，Chengdu6China

Abstract：On January7，2025，an earthquake struck Dingri County， Shigatse City， Xizang Autonomous Region，causing widespread building damageand casualties.This study integrates satelite radar imagery from multiple domesticand international sources to derive the surface deformation field of the Dingri earthquake.The results ndicate thatthe earthquake was triggered by coseismic normal faulting along the seismogenic Dengmo Cuo fault，with a rupture length exceeding 45km .The main surface deformation was concentrated on the western flank of the fault， with a maximum displacement of 2.1m .InSAR coherence，pre- and post-earthquake radar backscater coeficients，and field surveys were comprehensively utilized to assessbuilding damage in the affected region.The analysisreveals that the house collpse rate decreases with increasing distance from the fault.The northwest lake shore region of Dengmo Cuo，including Changshuo township and nearby villages，suffered the most severe damage， with the house collapse rate exceeding 75% in some areas.In contrast， regions near the epicenter， such as Chaji village， experienced relatively minor damage， suggesting smaller coseismic fault displacement in the source region. Field investigations further confirmed the absence of significant surface rupture near the epicenter.

Key words： Dingri earthquake； coseismic InSAR deformation； coseismic fault rupture； seismic damageassessment；earthquake field investigation

据中国地震台网测定，2025年1月7日9时5分，西藏自治区日喀则市定日县发生 级地震，震源深度 10km ，震中位于北纬 ，东经 （图1）。（剩余14052字）