Long-term Activity of Earthquake-induced Landslides: A Case Study from Qionghai Lake basin, Southwest of China  

作　　者：WEI Xue-li CHEN Ning-sheng CHENG Qian-gong HE Na DENG Ming-feng TANOLI Javed Iqbal 

机构地区：[1]Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong Universit [2]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences

出　　处：《Journal of Mountain Science》2014年第3期607-624,共18页山地科学学报（英文）

基　　金：partly supported by the National Natural Science Foundation of China (Grant Nos. 41172260);the Ministry of Science and Technology of the People’s Republic of China (2011BAK12B02) ;the National Basic Research Program of China (973 Program) (Grant No. 2008CB425801)

摘　　要：Earthquake-triggered landslides are a major geological hazard in the eastern Tibetan Plateau, and have prolonged impact on earth surface processes and fluvial system. To determine how long co-seismic landslides affect basins, a massive number of landslides existing in Qionghai Lake Basin were investigated for landslide distribution characteristics and geomorphological evidences, with further comparison and analysis using historic seismic analog method. The landslides found in Qionghai Lake Basin showed clear features of seismic triggering with strongly controlled by Zemuhe fault. These landslides are still active at present. Some new slides generally occur in ancient slope failure zones causing serious secondary hazards in recent years. In this study we strengthen the idea that the landslides triggered by the 185o Xichang earthquake （Ms7.5） have long term activity and prolonged impact on the mountain disasters with a period of more than 16o years. Our results support growing evidence that coseismic landslides have a prolonged effect on secondary disasters in a basin, and invite more careful consideration of the relationship between current basin condition and landslide history for a longer period.

关 键 词：Qionghai Lake EARTHQUAKE LANDSLIDE Debris flow Sediment yield 

分 类 号：P642.22[天文地球—工程地质学] X826[天文地球—地质矿产勘探]