2013年四川芦山地震次生山地灾害发育规律  

Features of secondary mountain hazards triggered by the 2013 Lushan Earthquake, Sichuan Province

作　　者：张佳佳[1,2,3] 李海兵[2,3] 赵国华 李勇[1] 颜照坤[1] 王焕[2,3] 云锟[1,2,3] 

机构地区：[1]成都理工大学,四川成都610059 [2]大陆构造与动力学国家重点实验室,北京100037 [3]中国地质科学院地质研究所,北京100037 [4]核工业西南勘查设计研究院,四川成都610061

出　　处：《地质通报》2015年第5期898-907,共10页Geological Bulletin of China

基　　金：中国地质调查项目(编号:1212011121267;1212011220264)

摘　　要：2013年4月20日8时02分,青藏高原东缘龙门山南部地区发生了芦山地震（Ms 7.0）,此次地震诱发了大量次生山地灾害.以地震重灾区宝兴作为研究区,利用卫星遥感影像、数字高程模型和高清航拍图像,以及崩塌滑坡数据统计分析,并结合野外调查研究,对区内次生山地灾害的空间分布与岩性、断裂和坡度关系进行了分析和探讨,总结了宝兴地区地震诱发的次生山地灾害发育规律：①以中小型崩塌滑坡为主,且沿省道S210集中分布;②崩塌滑坡主要发生在宝兴杂岩区浅表强风化层及第四系松散堆积层;③研究区内发育的五龙断裂和小关子断裂不是芦山地震的同震断裂;④该区域70％的崩塌滑坡发生在坡度大于30°的区域范围内,30-40°坡度段崩塌滑坡最为集中;⑤人类工程活动是宝兴地区次生山地灾害集中发育在S210省道两侧的主要原因;⑥在汶川地震和芦山地震2次地震及其余震的频繁加载作用下,宝兴地区崩塌滑坡的活动性增加,未来几年将是中小规模崩塌滑坡发育的高峰期.At 8：02 am, 20 April 2013, the Ms 7.0 Lushan earthquake struck the southern area of the Longrnen Mountain on the easteru margin of the Tibetan Plateau in Sichuan Province. A lot of geohazards followed this earthquake. Taking the hazards-prone Baoxing area as the study area and based on the remote sensing analysis, digital elevation model, statistic analysis and field investigation, the authors analyzed the distribution of the geohazards and the relationship between hazards and lithology, faults and slope gradient and, on such a basis, summarized the features of seismic geohazards in the Baoxing area： （1）Hazards are mostly small or medium-sized collapses and landshdes, and are mostly distributed along road S210. （2）Collapses and landslides mainly occur in the highly weathered layers of the Baoxing complex and Quaternary superficial layer. （3）Wulong and Xiaoguanzi faults are not coseismic faults of Lushan earthquake. （4）In the study area, 70% of collapses and landslides occur in the areas whose slope is steeper than 30%, and the slope of most geohazards range from 30% to 40%. （5）Human engineering activity is the main controlling factor of the geohazards distributed along road S210. （6）Because the slopes impacted by the Wenchuan and Lushan earthquakes become very unstable, landshdes, collapses and debris flow are more prone to occur, and hence the coming several years will be the high-incidence period.

关 键 词：芦山地震 崩塌滑坡 坡度 宝兴地区 龙门山 

分 类 号：P511.2[天文地球—地质学]