Abstract:On January 7, 2025, a magnitude 6.8 earthquake occurred in Cuoguo Township, Dingri County, Shigatse City, Xizang Autonomous Region, with a focal depth of 10 km. The meizoseismal area is located in a high-altitude and extremely cold area, with an epicenter intensity of IX. The epicenter of this earthquake is located in the Shenzha-Dingjie Rift Valley within the Lhasa terrane of the Qinghai Xizang Plateau. The seismogenic fault is the Dengmo Fault, which is mainly a normal fault with a maximum coseismic displacement of nearly 3 meters. Based on the survey of residential building styles in the earthquake-prone regions of Xizang prior to the earthquake, this paper provides a summary of significant destructive earthquakes that have occurred in Xizang from 1980 to 2024. The seismogenic structure of the Dingri 6.8 earthquake and the seismic damage to local residential buildings is analyzed. The research results indicate that the Dingri 6.8 earthquake is one of the most powerful, intense, and devastating seismic events in Xizang in recent years, causing significant casualties. Local residential buildings predominantly feature wall-lifted beam structures. The primary earthquake-induced damages include the peeling or complete collapse of self-supporting walls, external wall cracking, and house collapses due to heavy roofing. Additionally, wooden columns were fractured, beam-column connections were damaged, and non-structural components fell. Finally, a comprehensive analysis was conducted to identify the factors contributing to the severe casualties in this earthquake.
