基于地震记录的2025年2月8日四川省宜宾市筠连县山体滑坡运动过程分析OA

At approximately 11:50 a.m.Beijing time on February 8,2025,a sudden landslide occurred in Gaojiaping,Jinping Village,Mu'ai Township,Junlian County,Yibin City,Sichuan Province,resulting in severe casualties and property damage.To investigate the dynamics of the landslide,we analyzed the associated seismic records.The seismic signals generated by the landslide were clearly recorded at five nearby seismic stations,exhibiting two distinct impulsive phases that stood out from the background noise.The total duration of the seismic signal was 99 s,with frequency content ranging from 0.1 Hz to 10.0 Hz.A detailed analysis was conducted in conjunction with geological conditions and the landslide's path,leading to the following conclusions:(1)Based on the seismic signal characteristics and the spatial distribution of seismic stations,two primary sliding phases were identified,and their respective onset times and durations were determined.(2)Considering the generation mechanisms of long-and short-period seismic signals and frequency-dependent signal characteristics under topographical constraints,the first sliding phase was further subdivided into four stages,while the second phase was classified into three broader stages.This study provides scientific insights into the disaster-causing process of the Gaojiaping landslide and offers valuable references for future landslide hazard mitigation efforts.