【摘要】 汶川8.0级地震共触发地质灾害13 759处,灾区39个县(市、区)的地质灾害发育密度达14.02处/100 km2。该文采用以上数据,探讨了地震地质灾害的区域性分布规律,着重分析了地震地质灾害与地震烈度、地层岩性、地形坡度及海拔高程等影响因素的关系,得出以下认识:1研究区地震地质灾害主要分布于发震断裂两侧30 km范围内,在区域上表现出沿龙门山中央断裂呈"带状"分布、沿水系呈"线状"或"串状"分布的特征;2地震地质灾害发生的斜坡部位与微地貌形态有着密切的关系,地震地质灾害多沿山脊线或分水岭部位高位分布;3地震地质灾害的发育程度与地震烈度呈正相关关系,地质灾害的发育密度,随着地震烈度等级的降低而降低;4地震地质灾害主要发育在较软岩岩组和坚硬岩岩组内,在地震力作用下,软岩岩组内更容易引发滑坡灾害,崩塌多发育在坚硬岩组内;5在海拔1 000~1 500 m,斜坡坡度30°~50°区域范围内是地质灾害集中发育区,不同坡度范围内,地震地质灾害表现出不同的优势发育类型。更多还原

【Abstract】 Wenchuan M8. 0 earthquake triggered 13759 geological disasters in total,and the geological disaster development density of 39 counties( cities,districts) is 14. 02 /100 km2. According to the above data,regional distribution pattern of seismic and geological disasters are discussed. It is mainly focused in the analysis on the relationship between geological disasters and the influencing factors including earthquake intensity,lithology,terrain slope and altitude,and the following conclusions are derived: 1 In the research area,the geological disasters mainly distributed along both sides of the coseismic fault and within 30 km of the coseismic fault. On the regional scale,the distribution pattern appears zonal distribution along Longmenshan central fault,and linear distribution or string-like distribution along the water system. 2 The slope position of geological disasters has close relationship with micro-landforms,and the geological disasters distributed mainly on the high position along the ridgelines and watersheds. 3 The development level of geological disasters has positive relationship with earthquake. The development density of geological disasters decreases as the earthquake intensity decreases. 4 Geological disasters mainly develop in relative soft rock formations and hard rock formations. By the effect of earthquake force,landslides usually occur in soft rock formation,and rock falls often develop in hard rock formation. 5 Geological disasters mainly develop within the area where the altitude is from 1000 to 1500 m,and the slope is from 30° to 50°. In different ranges of slope,geological disasters demonstrate different advantage developmental patterns.更多还原