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汶川大地震驱动了大量的同震崩塌、滑坡等地质灾害,这些地质灾害同时造成了山谷中大量的松散堆积物堆积,并将以泥石流的形式进入河流系统,造成震后大规模的泥石流地质灾害,这也是地震灾区在震后面临的最为严峻的问题。根据本项目组的卫星影像处理和实地观测工作,以及前人对同震地质灾害研究获得的数量资料,对同震地质灾害数量在平行于断裂方向和垂直于断裂方向两个方向上的分布特征进行了精确刻画,据此确定了同震地质灾害引发的松散堆积物的空间分布情况,并根据震后三年来泥石流地质灾害发生区域,确定泥石流地质灾害高危区的宏观分布:在北东—南西方向上,映秀与北川之间、平通与青川之间为泥石流地质灾害高危区;在北西—南东方向上,北川—映秀断裂以东10～15km、以西16～37km的范围内为泥石流地质灾害高危区。这些宏观分布数据可为震后群发性泥石流地质灾害的预测和防治提供重要的参考依据。
The Wenchuan earthquake triggered a large number of geological disasters such as coseismic collapse and landslides. These geological disasters also caused a large accumulation of loose sediments in the valleys and entered the river system in the form of debris flows, resulting in massive debris flow geological disasters after the earthquake This is also the most serious problem that the earthquake stricken area is facing after the earthquake. According to the satellite image processing and field observations of the project team as well as the previous data on the number of studies on coseismic geological disasters, the distribution characteristics of the amount of coseismic geological disasters in both directions parallel to the fault and to the direction perpendicular to the fault According to this, the spatial distribution of loose debris caused by coseismic geological disasters is determined. According to the occurrence area of debris flow geological disasters in the past three years after earthquake, the macroscopic distribution of high risk areas of debris flow geological disasters is determined: Direction, between Yingxiu and Beichuan and between Pingtung and Qingchuan, there are high-risk areas for geological disasters such as mud-rock flow. In the northwest-south-east direction, geological disasters such as debris flow are located in the range of 10 ~ 15km east of Beichuan - Yingxiu fault and 16 ~ 37km west of the fault. High-risk area. These macro-distribution data can provide an important reference for the prediction and prevention of post-earthquake mass debris flow debris disasters.