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.