川西甘孜地区活动断裂与地质灾害分布相关性探讨

Discussion on the correlation between active fault and geological disaster distribution in the Ganzi area,western Sichuan province,China

活动断裂带的地质灾害效应是工程地质与地质灾害领域研究的重要内容。川西甘孜地区位于青藏高原东南缘,区内新构造运动强烈,地质灾害频繁发生,对人类生命财产安全造成威胁,对社会生活和经济建设起到了破坏作用。文章从活动断裂与地质灾害点空间分布之间关系进行分析研究,总结出两者在空间分布的规律。认为活动断裂是川西甘孜地区地质灾害孕育的内动力条件之一;在空间位置上关系密不可分,在主要活动断裂0~1 km范围内0.095处/km^(2)、1~2 km范围内0.050/km^(2)、2~5 km范围内0.029处/km^(2)频发。在活动断裂沿线开展针对地质灾害的监测和防范工作亟待落实,可为减轻或避免地质灾害提供依据和建议。

Geological disaster effect of active fault zone is a major research area in the field of engineering geology and geological disaster.Located in the west margin of the Qinghai-Tibet plateau,the Ganzi area in western Sichuan Province has underwent different geological events,which have created its unique topography,special landforms and geological phenomena.The intensive neotectonic movements in western Sichuan have caused frequent,various,and widely distributed geological disasters,threatening the safety of human life and property and damaging social life and economic development.In this study,we analyzed the correlation between active fault and spatial distribution of geological disaster sites,and summarized the rules between their spatial distributions.It is considered that active fault is one of the internal dynamic conditions causing geological disasters in the Ganzi area,and it is closely related to geological disasters in space.In average,around the main active fault,there is 0.1 site per km^(2) within the range of 0~1 km,0.05 site per km^(2) within 1~2 km and 0.3 site per km^(2) within 2~5 km.Geological disaster monitoring and prevention is urgently needed along the active faults,so as to provide basis and suggestions for reducing or avoiding geological disasters.