摘要
2025年1月7日,西藏自治区日喀则市定日县措果乡发生6.8级地震,震源深度10 km。极震区位于高海拔严寒地区,震中烈度达到Ⅸ度。此次地震的震中位于青藏高原拉萨地块内部的申扎—定结裂谷,发震断裂为登么错断裂,断层错动以正断层为主,最大同震位移量近3 m。基于震前在西藏地震危险区对藏式民居结构的调查结果,梳理1980—2024年西藏地区影响较大的破坏性地震,总结分析定日6.8级地震的发震构造特点及当地民居建筑的震害情况。研究结果表明:与西藏地区历年地震相比,定日6.8级地震的震级较大,烈度较高,人员伤亡较为严重;当地民居建筑多为墙抬梁式结构,震害主要表现为自承重墙体分层剥落甚至倒塌、墙体外闪、屋盖过重引起的房屋坍塌、木柱折断或梁柱节点破坏,以及非结构构件的坠落等。最后,对此次地震人员伤亡较为严重的原因进行总结分析。研究结果可为藏区民房震害防御提供参考依据。
On January 7,2025,an M_(S)6.8 earthquake occurred in Cuoguo Township,Dingri County,Shigatse City,Xizang Autonomous Region,with a focal depth of 10 km.The epicenter was located in a high-altitude frigid region along the Shenza-Dingjie rift within the Lhasa block of the Qinghai-Xizang Plateau.The Dengmo fault,the seismogenic fault of the earthquake,is characterized by normal faulting,with a maximum coseismic displacement of approximately 3 m.Using results from a survey of residential building structures in the earthquake-prone regions of Xizang prior to the earthquake,this paper provides a summary of significant destructive earthquakes that occurred in Xizang from 1980 to 2024.The seismogenic structure of the Dingri M_(S)6.8 earthquake and seismic damages to local residential buildings are also analyzed.The research results indicate that the Dingri M_(S)6.8 earthquake is an earthquake with large magnitude,high intensity,and serious casualties compared with the earthquakes that occurred in Xizang over the years.Most residential buildings in the local area are wall-lifted beam structures.The earthquake damages include the peeling or even collapse of self-supporting walls,external wall cracking,house collapse due to overweight roofs,broken wooden columns or beam-column joints,and the fall of nonstructural components.Finally,a comprehensive analysis is conducted to identify the factors contributing to the severe casualties in this earthquake.
作者
王言侨
李祥秀
王宁
吴清
卢晨虎
刘爱文
WANG Yanqiao;LI Xiangxiu;WANG Ning;WU Qing;LU Chenhu;LIU Aiwen(Institute of Geophysics,CEA,Beijing 100081,China)
出处
《地震工程学报》
北大核心
2025年第3期700-708,共9页
China Earthquake Engineering Journal
基金
国家自然科学基金(42494860,52278540)
北京市自然科学基金(8242021)。
关键词
定日地震
房屋建筑
藏式传统民居
震害分析
Dingri earthquake
building structure
Xizang residential buildings
seismic damage analysis
