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县城位于龙门山后山地震断裂带上。区内高山林立，河流深切。地表为西北高、东南低，地貌以峡谷地带为主。县内山峰多在海拔2,000m左右，相对高度在500～1,500m左右，境内地质构造复杂，，是全国地震活跃地区之一。岷江自北向南纵贯全境。
地震后特大规模的山体崩塌使县城的岷江两岸都变成裸岩、裸土，构成连绵不断的巨大沙尘源。遇到晴天，午后河谷风溯江而上，江两岸都处在沙尘暴笼罩之中，， 最低能见度只有不足二十米。地震使地质结构发生巨大变化，江河水位猛涨，堤破溃，江水倒流下来，有湖形成，造成河滩面积上升，水流减缓
Longmenshan mountain town is located on an earthquake fault zone. Many mountains in the region, deep river. For the high ground in the northwest, southeast lower canyon area mainly to the landscape. Multi-County mountains at an altitude of about 2000m, in relatively high at around 500 ~ 1500m, the territory of the complex geological structure, is one of the national seismic active region. Minjiang River that runs its length from north to south throughout.

Special large-scale earthquake collapse of the mountain so that the county seat of the Minjiang the two sides have become Uncovered Rock, bare soil, pose a huge continuous Shachen Yuan. Encounter sunny afternoon wind Sujiangershang Valley, Jiang Liangan are shrouded in dust storms, the minimum visibility of less than 20 meters. So that the seismic geological structure of the enormous changes in the river water level rose, Pokui embankment, back down the river, lake formed, resulting in rising flood land area, slowing water flow.

Longmenshan mountain town is located on an earthquake fault zone. Many mountains in the region, deep river. For the high ground in the northwest, southeast lower canyon area mainly to the landscape. Multi-County mountains at an altitude of about 2000m, in relatively high at around 500 ~ 1500m, the territory of the complex geological structure, is one of the national seismic active region. Minjiang River that runs its length from north to south throughout.
Special large-scale earthquake collapse of the mountain so that the county seat of the Minjiang the two sides have become Uncovered Rock, bare soil, pose a huge continuous Shachen Yuan. Encounter sunny afternoon wind Sujiangershang Valley, Jiang Liangan are shrouded in dust storms, the minimum visibility of less than 20 meters. So that the seismic geological structure of the enormous changes in the river water level rose, Pokui embankment, back down the river, lake formed, resulting in rising flood land area, slowing water flow

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