“5.12”汶川地震由于震级高、持续时间长、震区地质环境复杂,因而触发了大量的崩塌、滑坡。地震一年来,作者根据灾后对崩滑地质灾害的应急排查,并结合震后有限的ALOS、ASTER以及航空摄影等多源数据对地震重灾区的崩滑体数量进行了统计分析,获得确定性的崩滑灾害点有16 704处,但是,由于排查范围及遥感数据的局限性,上述数据并不能代表这次地震触发崩塌滑坡总的数量。为了查明这个问题,本文在上述资料的基础上,采用不同烈度地区典型抽取样本统计的方法,获得了不同烈度区崩塌滑坡的发育密度,进而根据不同烈度区面积统计得出了本次地震触发崩塌滑坡数量的估计值,并与国际上若干大地震触发崩塌滑坡数量及分布面积进行了对比分析。最后,作者给出了灾区地震触发崩塌滑坡的密度分布图,并讨论了其分布特征。本文的研究结果表明:汶川地震触发的崩塌滑坡数量约为3.5万处,分布面积约为10×104km2,发育密度最高在映秀-北川断裂上盘都江堰和彭州段以及沿岷江河谷的映秀-草坡段,约为5~6处/km2。 “5.12 ” Wenchuan earthquake due to high magnitude, long duration, complex geological environment in the earthquake zone, which triggered a large number of landslides. In the past year, based on the emergency investigation of the landslide-prone geological disasters after the earthquake and based on the multi-source data such as ALOS, ASTER and aerial photography after the earthquake, the author made statistical analysis on the number of landslides and landslides in the earthquake-hit areas and obtained certainty However, the above data do not represent the total number of landslides triggered by the earthquake due to the limited coverage and remote sensing data. In order to find out the problem, on the basis of the above data, this paper uses the method of statistical sampling in different intensity regions to obtain the development density of landslides in different intensity regions, and then obtains the trigger of this earthquake according to the statistics of different intensity regions Landslides and the number of landslides triggered by several major earthquakes in the world were compared and analyzed. Finally, the author gives the density distribution map of landslides triggered by the earthquake and its distribution characteristics. The results of this study show that the number of landslides triggered by the Wenchuan earthquake is about 35,000, with a distribution area of ​​about 10 × 104km2. The highest developmental density is between Yingxiu-Beichuan fault plateau in Dujiangyan and Pengzhou, Yingxiu-Caopo along the Minjiang River valley Section, about 5 to 6 / km2.