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Title:: Analysis on Spatial Distribution and Influencing Factors of Geological Disasters in Southeast Tibet

作者:: 王盈¹; 金家梁²; 袁仁茂¹; (1.中国地震局地质研究所活动构造与火山研究重点实验室,北京 100029; 2.国家发展和改革委员会城市和小城镇改革发展中心,北京 100045)

Author(s):: WANG Ying¹; JIN Jialiang²; YUAN Renmao¹; (1. Key Laboratory of Active Tectonics and Volcano,Institute of Geology,China Earthquake Administration,Beijing 100029,China)(2. Urban and Small Town Reform and Development Center,China Center for Urban Development,Beijing 100045,China)

Keywords:: Southeast Tibet; geological hazards; development laws; influencing factors

摘要:: 综合已有研究成果,在地质灾害解译的基础上,对藏东南地区的崩塌、滑坡、泥石流等地质灾害的分布特征、发育规律及其影响因素进行了分析。结果表明:研究区地质灾害点主要分布在雅鲁藏布江流域北段以及“三江”流域南北两侧,在空间展布上具有不均匀性和分段群集性。在断裂活动、地层岩性、地形地貌以及人类工程活动等因素的影响下,地质灾害点集中发育在高山峡谷地貌、河流切割强烈的地区,以大理岩、板岩、白云岩、石灰岩、钙质砂岩、超基性岩类等为主的较坚硬岩类和以片岩、片麻岩类为主的较坚硬-较软弱岩性分布的地区,断裂带分布、构造活动强烈的地区以及人类工程活动强烈的地区,如主要公路沿线等。

Abstract:: Based on interpretation of geological hazards and previous reported research results,we analyzed the distribution characteristics,development laws and influencing factors of geological disasters,such as collapses,landslides and debris flows in Southeast Tibet. The results show that geological disasters characterized by inhomogeneity and sectional clustering are mainly distributed in northern part of Yarlung Zangbo River and the north and south sides of the “Three-Rivers”(Jinsha River,Lancang River and Nu River). Many factors including active fault,lithology,topography and human activities influenced the development and spatial distribution of geological disasters in Southeast Tibet. The geological hazards are concentrated in the areas featured with alpine-gorge landforms and the strong incising region of river,the zones with harder rocks mainly consist of marble,slate,dolomite,limestone,calcareous sandstone and ultrabasic rocks,and hard-weaker rocks mainly consist of schist and gneiss,and the region distribute fault zones and strong tectonic activities,and areas affected by strong human activities,such as along major highways,etc.