成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：173-184,12.DOI:10.12474/cdlgzrkx.2025011901
2025年1月7日西藏定日MS6.8级地震形变场特征及场地效应分析
Deformation field characteristics and site effect analysis of the MS 6.8 Dingri earthquake in Xizang on January 7,2025
摘要
Abstract
At 09:05 PM on January 7,2025,a magnitude 6.8 earthquake struck Dingri County(28.50 degrees north latitude,87.45 degrees east longitude)in Rikaze City,Xizang,with a epicenter depth of 10 km.It was the largest earthquake in this area in recent years.The earthquake occurred in the intersection area of the Shenzha-Dingjie rift valley and southern Tibet detachment system.By means of field investigation,radar remote sensing analysis,and optical remote sensing interpretation,the geological background,deformation field,surface rupture characteristics,and seismic site effects of the MS 6.8 Dingri earthquake in Xizang are analyzed in detail.The following results were obtained:(1)Through InSAR technology analysis and optical remote sensing interpretation,it is revealed that the strong surface displacement caused by the earthquake mainly manifested as a vertical downward component and a relative left-lateral component of the upper wall in the northern section.It is inferred that the motion mechanism of the ascending fault is mainly normal fault movement of the upper wall in the north section,with a small amount of left-lateral movement.(2)Surface ruptures induced by the earthquake are significant,where that in the northern section is significant and that in the southern section is relatively weak.The rupture zone is consistent with the boundary shape of Dengmocuo Lake,and the overall characteristics are characterized by tension collapse.(3)In terms of site effect,the earthquake caused serious damage to buildings,which manifested as fault zone damage,hanging walls,fault extension direction,and house damage;in particular,soil and wooden houses were seriously damaged.In addition,the earthquake did not induce large-scale geological disasters,and only a small number of landslides and collapses were found in local areas.The research in this paper provides a scientific basis for understanding the seismic activity in this area,improving the ability of earthquake disaster prevention and post-disaster reconstruction.关键词
西藏定日县/6.8级地震/InSAR形变场/地表破裂/场地效应Key words
Dingri County,Xizang/magnitude 6.8 earthquake/InSAR deformation field/surface rupture/site effect分类
地质学引用本文复制引用
赵伟华,许强,吉锋,解明礼,范宣梅,王运生,赵建军..2025年1月7日西藏定日MS6.8级地震形变场特征及场地效应分析[J].成都理工大学学报（自然科学版）,2025,52(4):173-184,12.基金项目
地质灾害防治与地质环境保护全国重点实验室自主研究课题(SKLGP2023Z021,SKLGP2024K030) （SKLGP2023Z021,SKLGP2024K030）
国家社会科学基金重大项目(24&ZD164). （24&ZD164）
