Rapid Simulation of Acceleration Waveform at Everest Seismic Station of Xizang Tingri M_S6.8 Earthquake on January 7, 2025

On January 7, 2025, a magnitude M_S6.8 earthquake occurred in Dingri County, Shigatse City, Xizang, China, causing severe damage near the epicenter. The affected area is located on a plateau at over 4, 000 meters above sea level, where seismic stations are sparsely distributed. There is a lack of comprehensive reference data or basic seismic records within a 100 km radius, which are essential for quickly assessing the extent of earthquake damage and guiding post-earthquake reconstruction efforts. The high mountain region affected by this earthquake is mostly covered with permanent glaciers, such as those on Mount Everest, and contains numerous potential landslide sites. Studying the impact of earthquakes on the stability of glaciers and landslides is an important scientific concern. Given this context, this article focuses on an M_S3.9 small earthquake recorded at the XZ-ZHF seismic station, located 55 km from the epicenter. Using the empirical Green's function method, the study considers parameter uncertainty to synthesize the acceleration waveform of the earthquake at this station. The research results indicate that the horizontal peak ground acceleration (PGA) at Zhufeng seismic station ranged from 70 to 190 cm/s², while the vertical PGA ranged from 40 to 140 cm/s². This corresponds to an instrument seismic intensity of Ⅵ-Ⅶ. These findings reflect the seismic intensity at the Zhufeng Seismic Station. When compared with the seismic response spectra of various probability levels in the fifth-generation Seismic ground motion parameters zonation map of China, and taking into account the structural integrity of local buildings, it is analyzed that the seismic intensity could cause more severe damage to general civil structures near the Zhufeng seismic station. Furthermore, it is expected that the earthquake damage near the epicenter is likely to be even more severe. Additionally, the earthquake may have implications for the stability of high-altitude glaciers and potential landslide bodies, and it is recommended that special attention be paid to these issues.