GIS-based Earthquake-Triggered Landslide Hazard Zoning Using Contributing Weight Model  

作　　者：WANG Meng 

机构地区：[1]Institute of Mountain Hazards and Environment, ChineseAcademy of Science, Chengdu 610041, China [2]Graduate University of ChineseAcademy of Sciences, Belling 100049, China [3]Key Laboratory of Geo-surface Process and Mountain Hazards, Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China

出　　处：《Journal of Mountain Science》2010年第4期339-352,共14页山地科学学报（英文）

基　　金：supported by the 973 Program of China (Grant No.2008CB425802);the International Cooperation Program of the Ministry of Science and Technology of China (Grant No.2007DFA21150 and 2009DFB20196)

摘　　要：Earthquake-triggered landslides have aroused widespread attention because of their tremendous ability to harm people's lives and properties.The best way to avoid and mitigate their damage is to develop landslide hazard maps and make them available to the public in advance of an earthquake.Future construction can then be built according to the level of hazard and existing structures can be retrofit as necessary.During recent years various approaches have been made to develop landslide hazard maps using statistical analysis or physical models.However,these methods have limitations.This study introduces a new GIS-based approach,using the contributing weight model,to evaluate the hazard of seismically-induced landslides.In this study,the city and surrounding area of Dujiangyan was selected as the research area because of its moderate-high seismic activity.The parameters incorporated into the model that related to the probability of landslide occurrence were:slope gradient,slope aspect,geomorphology,lithology,base level,surface roughness,earthquake intensity,fault proximity,drainage proximity,and road proximity.The parameters were converted into raster data format with a resolution of 25×25m2 pixels.Analysis of the GIS correlations shows that the highest earthquake-induced landslide hazard areas are mainly in the hills and in some of the moderately steep mountainous areas of central Dujiangyan.The highest hazard zone covers an area of 11.1% of the study area,and the density distribution of seismically-induced landslides was 3.025/km2 from the 2008 Wenchuan earthquake.The moderately hazardous areas are mainly distributed within the moderately steep mountainous regions of the northern and southeastern parts of the study area and the hills of the northeastern part;covering 32.0% of the study area and with a density distribution of 2.123/km2 resulting from the Wenchuan earthquake.The lowest hazard areas are mainly distributed in the topographically flat plain in the northeastern part and some of the relatively gently slo

关 键 词：Earthquake-triggered landslide GIS Contributing weight model Hazard zoning 

分 类 号：P642.22[天文地球—工程地质学] P315.5[天文地球—地质矿产勘探]