汶川地震强震区地震诱发滑坡与后期降雨诱发滑坡控制因子耦合分析  

COUPLING ANALYSIS OF CONTROL FACTORS BETWEEN EARTHQUAKE-INDUCED LANDSLIDES AND SUBSEQUENT RAINFALL-INDUCED LANDSLIDES IN EPICENTER AREA OF WENCHUAN EARTHQUAKE

作　　者：齐信[1,2] 唐川[2] 陈州丰[1] 邵长生[1] 

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《工程地质学报》2012年第4期522-531,共10页Journal of Engineering Geology

基　　金：科技基础性工作专项项目(2011FY110100);中国地质调查局项目(1212011120097)资助

摘　　要：本文以汶川地震强震区北川县典型研究区为例,利用高分辨率航片、SPOT5卫星图像对北川县典型研究区进行了"5.12"地震之后和"9.24"降雨之后诱发的滑坡解译,解译结果显示:"5.12"地震诱发滑坡1999个,"9.24"强降雨诱发滑坡828个,"9.24"强降雨导致原有地震滑坡面积扩大的滑坡150个。研究表明:地震和强降雨都是诱发滑坡的动力成因,"9.24"强降雨诱发的滑坡面积是"5.12"地震诱发滑坡面积的1/4倍,强降雨诱发滑坡的数量增加了41.4%;强降雨不仅诱发新的滑坡,而且促使原来地震滑坡复活,并扩大其面积,强降雨导致地震诱发的滑坡面积扩大了原面积的68.7%。同时,在遥感解译数据基础之上,开展地震诱发滑坡与降雨诱发滑坡规模对比和控制因子耦合分析及地震与降雨耦合灾害链模式研究,为进一步分析研究地震灾区滑坡的产生、发展趋势、危险性和风险评价等预测预报提供科学依据,也为汶川震区恢复重建中的减灾防灾提供决策参考。This paper selects typical study area in epicenter area of the Beichuan as the site for the landslides interpretations induced after the Wenchuan Earthquake on May 12, 2008 and the strong rainfall on September 24, 2009.It bases on high-resolution aerial photographs and remote sensing SPOT 5 imagery. The results are as follows, the number of the earthquake-induced landslides is 1999. ＂the number of the rainfall-induced landslides is 828. the rainfall enlarged the 150 earthquake-induced landslides. The earthquake and the rainfall are powerful causes for the occurrence of landslides, the rainfall-induced landslide area is 25% larger than the earthquake-induced landslide area.So, the landslide number in the study areais increased by 41.4%. The strong rainfall not only induced new landslides but also made the original earthquake landslides raise, and to expand the area so that the landslide area increased by68. 7%. Meanwhile, on the basis of remote sensing data interpretation, the paper further analyse the induced landslides, carries out the trends, hazard and risk evaluation, which provides a scientific prediction basis. The findings in this paper can be useful to the Wenchuan Earthquake restoration and reconstruction in disaster mitigation and preparedness and provide the decision-makers to carry out earthquake-induced landslides and rainfall-induced landslides scale contrast and control factor coupling analysis and the earthquake and rainfall coupling disasters chain mode.

关 键 词：汶川地震 强震区 地震诱发滑坡 降雨诱发滑坡 

分 类 号：P642.22[天文地球—工程地质学]