九寨沟地震前后次生地质灾害分布特征分析  

ANALYSIS ON DISTRIBUTION CHARACTERISTICS OF SECONDARY GEO-HAZARDS BEFORE AND AFTER JIUZHAIGOU EARTHQUAKE

作　　者：刘果 张友谊[1] 张珊珊 叶小兵 袁亚东 LIU Guo;ZHANG You-yi;ZHANG Shan-shan;YE Xiao-bing;YUAN Ya-dong(Southwest University of Science and Technology,School of Civil Engineering and Architecture,Mianyang 621010,China)

机构地区：[1]西南科技大学土木工程与建筑学院,绵阳621010

出　　处：《地质灾害与环境保护》2018年第3期1-4,共4页Journal of Geological Hazards and Environment Preservation

摘　　要：为研究九寨沟地震前后次生地质灾害分布特征,本文应用Arcgis软件平台,对研究区震前472处和震后新增272处地质灾害的分布特征进行统计分析,得出以下结论:(1)80.88%震后新增灾害点分布在距震中30km范围内,灾害点密度随震中距的增大而减小。67.28%新增灾害点分布在烈度Ⅷ度及以上区域,灾害点密度随地震烈度的降低而减小。(2)地震前后灾害点均集中分布在距河流300m范围内,各占总数的79.45%和81.25%,灾害点数量与密度均随着与河流距离的增加而显著降低。(3)地震前后在高程2 000～2 600m灾害点数量最多,高程2 600～3 200m次之。(4)地震前后分布在15°～45°坡度范围内灾害点数量分别占总数的82.2%和84.2%。(5)滑坡、崩塌等次生地质灾害为泥石流发育提供较好的物源条件,在未来3～5a雨季应切实做好泥石流防治工作。In order to study the distribution of secondary geo-hazards before and after jiuzhaigou earthquake,this paper statistically analyzed the distribution of 472 geo-hazards before the earthquake and the 272 new geo-hazards and main influencing factors at the study area by Arcgis.The results show that：1.80.88% of new geo-hazards distributed within 30 km from the epicenter,and the density decreased with the increase of epicentral distance.2.Pre-earthquake and post-earthquake new geo-hazards within a distance of less than 300 maway from river,accounting for 79.45% and 81.25% of the total number of disasters respectively.the number and the density decreased significantly with the distance from the river.3.New geo-hazards are mainly shallow landslide and collapses,and well developed in limestone,sandstone and quaternary soil.4.The most geo-hazards distributed in the elevation of 2 000～2 600 mup to 2 600～3 200 m.5.The number of pre-earthquake and added geo-hazards distributed in the slope of 15°～45° accounted for 82.2% and 84.2% of the total respectively.6.Secondary geo-hazards provide better source condition for the development of debris flow.In the next three to five years,the debris flow prevention and control should be effectively implemented during the rainy season.

关 键 词：九寨沟地震 地质灾害 分布规律 对比分析 

分 类 号：P315[天文地球—地震学] P694[天文地球—固体地球物理学]