中文摘要：

选取芦山地震涉及的21个县（市、区）为研究对象,应用野外实地踏勘和遥感解译相结合的方法,结合当地国土、水利、建设等部门提供的相关统计资料,已查明芦山地震灾区782处次生山地灾害（滑坡、崩塌和泥石流）,获取了这些次生山地灾害的基础信息.在GIS信息技术的支持下,对芦山地震灾区次生山地灾害的发育环境背景、分布特征和成因进行了初步的探讨分析.研究表明：芦山地震灾区次生山地灾害主要集中分布在烈度为Ⅷ-Ⅸ区、中低山区、坡度0°～40°、坡向为东西两向、第三系砂砾夹泥岩区、河流冲刷强烈和年降雨量＞1 200 mm的区域;发育成因主要是地形条件对次生山地灾害的形成的影响表现出与非地震条件下的新特征;地震效应重构了地表形态,为次生山地灾害发育提供了大量的松散固体物质;降水与河流冲刷作用的改变,影响边坡稳定性,为次生山地灾害提供动力;人类过度的社会经济活动加速了次生山地灾害的形成.

英文摘要：

In the 21st century,the global seismicity is in a relatively active period,which has occurred in several large destructive earthquake.Most destructive earthquakes are associated with the occurrence of secondary disasters.On April 20,2013 an earthquake of magnitude 7.0 occurred in Lushan county in Sichuan province （103°E,30°18′N）.The focal depth was 13 km.The Epicenter was about 100 kilometers away from Chengdu.Large energy was released by the earthquake.Local people suffered great harm and important buildings and facilities were severely damaged.We selected Lushan earthquake-stricken area including 21 counties （cities,districts） as the study area.We applied field survey and the high resolution remote sensing visual interpretation as the method.Combining the relevant statistical data of local land,water conservancy,construction and other departments,a systematic analysis on the main characteristics of secondary mountain hazards in Lushan earthquake-stricken area was performed in this study.There were 782 secondary mountain hazards which had been record their detailed information.With the support of GIS technology,we made further investigation about environmental background,distribution and cause of secondary mountain hazards in Lushan earthquake-stricken area,and finally the results showed that the secondary mountain hazards were mainly distributed in the areas with seismic intensity of Ⅷ-Ⅸ,low mountain elevation,slope gradient of 0°-40°,slope aspect of east and west,tertiary period mudstone gravel,intense river erosion activity and annual rainfall 〉 1 200 mm.The formation of secondary mountain hazards are mainly associated with landform,geological structure,climate,hydrology and human activities.Topography on the formation of secondary mountain hazards demonstrates the impact of non-seismic conditions of the new features.Reconstruction of the surface morphology under seismic effect and development provide a lot of loose solid materials for secondary mountain hazards.Precipitation and surface r