The 2023 Jishishan earthquake(Ms 6.2)was another strong earthquake that occurred in the eastern/northeastern margin of the Qinghai-Tibet Plateau after the 2022 Luding earthquake(Ms 6.8).Both earthquakes triggered large numbers of co-seismic landslides.To reveal the differences of the distributions and control factors of co-seismic landslides caused by the Jishishan and Luding earthquakes,distribution maps of co-seismic landslides were compared and analyzed using ground survey data,remote sensing interpretation data,and spatial superposition statistics.The results showed that the fault type controlled the dominant slope direction of co-seismic landslides as well as the spatial distribution along the vertical fault,where the"back slope"effect and"up-fault and down-fault"effect were clearly identified.Geomorphic conditions were the main factors affecting the spatial distribution characteristics of co-seismic landslides.The distribution of co-seismic landslides was"linear"in the mountain and canyon landforms in western Sichuan,and"planar"in the loess landforms in Longxi.Attention should be given to the differences of special soil type,climate,and vegetation cover in investigations and emergency treatment of co-seismic landslides.This research provided a scientific reference for the delineation of the key prevention areas of co-seismic landslides in different fault types and different geomorphic areas,including trend predictions and the post-disaster reconstruction.
关键词
积石山地震/泸定地震/地震地质灾害对比研究/同震滑坡分布特征/控灾因子
Key words
Jishishan earthquake/Luding earthquake/comparative research of co-seismic landslides/distribution characteristics of co-seismic landslides/hazard control factors
万方数据