Rapid report of seismic damage and consequence analysis in the 2025 M 6.8 Dingri earthquake

Abstract

On January 7, 2025, a M 6.8 earthquake occurred at Dingri County, Shigatse City, Xizang Autonomous Region, which is the most largest earthquake in this region in the most recent five years. The maximum recorded peak ground acceleration in this earthquake is 0.43 ​g, which is significantly higher than the local design basis earthquake intensity level. This report focuses on the post-earthquake seismic damage investigation of rural self-built houses and local public buildings, which shows quite different seismic performance. Collapse and heavy damage of rural self-built houses without seismic resistant measures were observed, while the masonry houses with seismic resistant measures show good seismic performance against collapse. The structural systems of public buildings with proper seismic design suffered slight seismic damage. Different form slight structural damage, the seismic damages of non-structural components, which resulted in the interruption of public building functionality were highlighted in this report. With the investigation results of seismic damage suffered by local houses and buildings, the casualty distribution and causes were analyzed in detail.