The distribution of landslides is related to geological and climatic factors. Generally, the following areas are prone and frequent areas of landslides:
(1) Banks, rivers, lakes (reservoirs), seas and gullies, and canyons with large terrain differences , slopes of mountainous areas, railways, highways, and engineering buildings. These zones provide favorable topographical conditions for the formation of landslides;
(2) Among the geological structural zones, such as fault zones and seismic zones. Generally, in areas with seismic intensity greater than 7 degrees, slopes with slopes greater than 25 degrees are prone to landslides during earthquakes; rock mass fractures and fractures in fault zones are very favorable for landslide formation;
(3) slippery (Slope) rock and soil distribution area. Such as loose overburden, loess, mudstone, shale, coal-bearing strata, tuff, schist, slate, phyllite and other rock and soil, providing a good material basis for the formation of landslides;
(4) rainstorm-prone areas. Or unusually heavy rainfall areas. In these areas, abnormal rainfall provides a favorable trigger for landslide occurrence. The superimposed area of the above-mentioned zone forms a dense development zone of the landslide. For example, China is a typical area from Taihang Mountain to Qinling, through Western Hubei, Sichuan, Yunnan to eastern Tibet. The landslide is extremely dense and the damage is very serious.
Landslides are common in southern China.Although the impact of typhoons is relatively small in southwest and northwest China, there are also a lot of landslides in rainy season.
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