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Causes of landslide
There are several factors that directly or indirectly cause slope instability. The major causes of landslide can be classified into two major categories as below.

Natural causes
This category has three major triggering mechanisms that can occur either singly or in combination (1) precipitation, (2) seismic activity, and (3) volcanic activity. Effects of all of these causes vary widely and depend on factors such as steepness of slope, morphology or shape of terrain, soil type, underlying geology, rock discontinuities and whether there are people or structures on the affected areas.

Artificial causes
Populations expanding onto new land and creating neighborhoods, towns, and cities are the primary means by which humans contribute to the occurrence of land¬slides. Disturbing or changing drainage patterns, destabilizing slopes, and deforestation are common human-induced factors that may initiate landslides. Other causative factors include over steepening of slopes by undercutting the bottom and loading the top of a slope to exceed the bearing strength of the soil or other component mate¬rial. However, landslides may also occur in once-stable areas due to other human activities such as irrigation, lawn watering, draining of reservoirs (or creating them), leaking pipes, and improper excavating or grading on slopes.

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