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玉树“4·14”地震发生后,地震造成山体松动、沟道堵塞,引发了许多滑坡、崩塌、泥石流等地质灾害。地质灾害的空间分布受地形地貌、地层岩性和人类工程活动等因素的影响,然而对于地震引发的地质灾害,其空间分布则主要还是受发震断裂的控制。选取巴塘河-结古镇地质灾害集中发育区进行了研究,发现玉树地震断裂对地质灾害发育有以下影响作用:(1)地震断裂两侧地质灾害发育分布存在一定的差异,地震地质灾害的强发育区是在断层两侧2500 m范围内,而500 m范围内地质灾害最为发育。(2)玉树地震引发的地质灾害主要分布于7度以上烈度区。(3)玉树地震滑坡、崩塌的优势主滑方向为东北—西南,近似垂直于发震断层走向。
After the Yushu earthquake hit “4 · 14”, the earthquake caused the loosening of the mountain and the blockage of the channel, triggering many geological disasters such as landslides, landslides and landslides. The spatial distribution of geological disasters is affected by topography, formation lithology and human engineering activities. However, the spatial distribution of geological disasters caused by earthquakes is mainly controlled by seismogenic faults. It is found that the Yushu earthquake fault has the following effects on the development of geological disasters: (1) There are some differences in the developmental distribution of geological disasters on both sides of the earthquake fault, and strong earthquake geological disasters The development zone is within 2500 m on both sides of the fault, and the geological disaster is the most developed within 500 m. (2) Geological disasters caused by the Yushu earthquake are mainly distributed in intensity areas above 7 degrees. (3) Advantages of landslide and collapse of Yushu earthquake The main slip direction is northeast-southwest, which is approximately perpendicular to the strike of faults.