(20 16。 How did the landslide happen?

As far as the influence of internal and external stress and human action is concerned, the areas with frequent crustal movement and human engineering activities are landslide-prone areas. External factors and actions can change the basic conditions of landslides, thus inducing landslides.

The main inducing factors are: earthquake, rainfall and snow melting, surface water scouring and soaking, and constant scouring of slope toe by surface water bodies such as rivers; Unreasonable human engineering activities, such as excavation of the toe of the slope, stacking on the upper part of the slope, blasting, reservoir water storage (drainage), mining, etc. , can induce landslides, as well as tsunamis, storm surges, freezing and thawing.