A comparative study of the main factors controlling geohazards induced by 10 strong earthquakes in Western China since the Wenchuan earthquake in 2008  

作　　者：Chao Peng Zhi-qiang Yin Xu-jiao Zhang Hai Shao Ming-fei Pang 

机构地区：[1]China University of Geosciences(Beijing),Beijing 100029,China [2]China Institute of Geo-Environment Monitoring,China Geological Survey,Ministry of Natural Resources,Beijing 100081,China [3]China University of Geosciences,Wuhan 430074,China

出　　处：《China Geology》2023年第1期70-84,共15页中国地质（英文）

基　　金：supported by the National Natural Science Foundation of China(41977258);the National Key Research and Development Program of China(2017YFC1501005 and 2018YFC1504704)。

摘　　要：Determining the main controlling factors of earthquake-triggered geohazards is a prerequisite for studying earthquake geohazards and post-disaster emergency response.By studying these factors,the geomorphic and geological factors controlling the nature,condition,and distribution of earthquake-induced geohazards can be analyzed.Such insights facilitate earthquake disaster prediction and emergency response planning.The authors combined field investigations and spatial data analysis to examine geohazards induced by seismic events,examining ten earthquakes including the Wenchuan,Yushu,Lushan events,to elucidate the main control factors of seismic geohazard.The authors observed that seismic geohazard occurrence is usually affected by many factors,among which active nature of the seismogenic fault,seismic peak ground acceleration(PGA),topographic slope and geomorphic height differences,and distance from the fault zone and river system are the most important.Compared with strike-slip earthquakes,thrust earthquakes induce more high-altitude and high-speed remote landslides,which can cause great harm.Slopes of 0°–40°are prone to secondary seismic geohazards,which are mainly concentrated 0–6 km from the river system.Secondary geohazards are not only related to seismogenic fault but also influenced by the associated faults in the earthquake area.The maximum seismic PGA and secondary seismic geohazard number are positively correlated,and the horizontal and vertical ground motions play leading and promoting roles in secondary geohazard formation,respectively.Through the research,the spatial distribution of seismic geohazards is predicted,providing a basis for the formulation of emergency response plans following disasters.

关 键 词：Wenchuan earthquake GEOHAZARDS Main control factors Comparative study Geological disater survey engineering Western China 

分 类 号：P315.9[天文地球—地震学] X43[天文地球—固体地球物理学]