关键词: 地质灾害, 分布特征, 活动性, 遥感解译, 易发性评价, 九寨沟地震,

Abstract: On August 8,2017,the Jiuzhaigou Valley Ms7.0 earthquake in Sichuan Province triggered more than 1000 co-seismic geological hazards.After the rainy season of 2018,some co-seismic hazards in the study area revive and new hazards occur,which bring new threats to post-earthquake reconstruction and ecological restoration in the Jiuzhaigou Valley.Based on the interpretation of post-earthquake geological hazards from three high-resolution remote sensing images around the rainy season in 2018 and combined with field investigation,the activity of post-earthquake geological hazards was studied by dividing the revival grade.Five factors(elevation,slope,slope direction,distance from fault,PGA)were taken to make a preliminary analysis on post-earthquake geological hazards.Finally,the deterministic coefficient method was used to evaluate the vulnerability of post-earthquake geological hazards in the study area.The results show that:373 post-earthquake geological hazards in the study area were eventually identified,and the total disaster area was about 2.15 km2.The quantity of post-earthquake geological hazards was less than co-seismic geological hazards,and the new-born small-scale collapse was dominant in post-earthquake geological hazards,and the impact of rainfall on new-born hazards was greater than that on revival hazards.The Zharu Temple and Panda Sea area were located in the high-risk area.The results are of positive significance to the study of geological hazards and post-earthquake reconstruction in Jiuzhaigou Valley.

Key words: geological hazards, distribution characteristics, activity, remote sensing interpretation, vulnerability assessment, Jiuzhaigou Valley earthquake