摘要： 为了揭示芦山7.0级地震次生山地灾害发育规律，结合遥感解译，震后第一时间对芦山震区开展了应急调查和危险性分析等工作.芦山7.0级地震诱发的地震地质灾害以小型崩塌为主，崩塌主要沿双石大川断裂带，北西向几个深切峡谷段，如S210芦山宝兴峡谷，芦山双石峡谷，芦山太平峡谷发育，其中震中附近的宝盛、太平及龙门崩塌密度最大.崩塌源主要分布在陡立谷坡中上部、突出山嘴等部位，堆积以块石、孤石及碎石为主，对灾区的公路破坏大，其次是坡脚的民房，并在今后一段时间内，威胁公路的正常运行.潜在不稳定斜坡和土质小型滑坡，由于沟道物源的增加，震后泥石流灾害链不可忽视.地震波强度及地形放大效应是控制灾害发育的主因，斜坡结构及风化也有重要的控制作用.
关键词： 芦山地震；次生山地灾害；分布特征；主控因素
中图分类号： P315.63文献标志码： ACharacteristics of Coseismic Landslides Triggered by the Lushan
Ms7.0 Earthquake on the 20th of April， Sichuan Province， ChinaHUANG Runqiu，WANG Yunsheng，PEI Xiangjun，LI Yusheng，LI Weile，LUO Yonghong
（State Key Laboratory of Geohazard Prevention and Environment Protection， Chengdu University of Technology， Chengdu 610059， China）
Abstract：In order to reveal the distribution laws of the secondary geohazards during the Lushan Ms7.0 earthquake， field investigations and interpretation of aerial photos after the earthquake were carried out to analyze the risk of the coseismic geohazards. The results show that rockfall was the main type of the coseismic geohazards. The rockfalls were mainly smallscaled ones and distributed along the area of the ShuangshiDachuan fault zone and the NWstrike gorges， such as the LushanBaoxing gorge， LushanShuangshi gorge， and LushanTaiping gorge， in which the rockfalls occurred most densely in the area near the epicenter， such as Taiping， Baosheng， and Longmen. The source areas of rockfalls in the cross section of the valleys were mainly located at the middle and upper parts of a hill slope and the spur of a hill. The accumulation was mainly composed of blocks and gravel， which buried the roads， became a great risk to vehicles and houses at the toe of slopes， and would threaten the normal operation of the road in the near future. As the potential unstable slopes and small slides increase the source in the valleys and ramp during the earthquake， the debris flow would happen frequently. The PGA （peak ground acceleration） magnitude and topographic amplification was the main reason of the geohazards， and the slope structures and weathering was the second factor.
Key words：Lushan earthquake； coseismic geohazards induced by earthquake； distribution characteristics； main controlling factors
据中国地震台网正式测定， 2013年4月20日8：02，四川省雅安市芦山县境内（北纬30.3°，东经103.0°）发生7.0级地震，震源深度为13 km，主震持续近30 s，震中距离成都约100 km.
据中国地震台网速报，截至5月7日20时，四川芦山 4·20地震共记录到余震8 182次，其中3.0级以上余震122次，包括5.0～5.9级4次， 4.0～4.9级22次， 3.0～3.9级96次，目前最大余震为5.4级.此次地震震源浅，震中烈度高（Ⅸ度），发震断裂为龙门山构造带南段前山断裂带.