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

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Abstract：At approximately 11：50 a.m. Beijing time on February 8， 2025， a sudden landslide occurred in Gaojiaping，Jinping Villge，Mu'ai Township，JunlianCountyYibinCity，Sichuan Province，resulting inseverecasualtiesand 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 99s with frequency content ranging from 0.1Hz to 10.0Hz . A detailed analysis was conducted in conjunction with geological conditionsand the landslide's path，leading to the following conclusions：（1） Based on the seismic signal characteristics andthe spatial distribution ofseismic stations，twoprimarysliding phases were identified，and their respective onset times and durations were determined. （2） Considering the generation mechanisms of long- and shortperiodseismic signalsand frequency-dependent signal characteristics under topographical constraints，the firstsliding 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 ofers valuable references for future landslide hazard mitigation efforts.

Keywords：Gaojiaping landslide in Junlian County；seismic network；signal characteristics；motion process analysis

北京时间2025年2月8日11时50分许，四川省宜宾市筠连县沐爱镇金坪村2组高家坪突发山体滑坡（图1）。（剩余20061字）