Introduction

In India, various types of landslides occur in especially in Himalayas, particularly in monsoon season that includes block falling, debris slide, debris flow, rock fall, rotating slip and crash. Landslide is defined as the gravitational activity of a bulk of rock, or bulk of earth or remains, downhill arranged a hill. It usually happens because of the unstable hilly slope occur by the natural causes such as ground water destabilize the slope, , quakes, volcanic outbreaks, soil erosion, etc. Landslides are triggered by heavy rainfall which give outcomes in the form of simple destruction to lives and property as well as the destruction of communication systems and movement of road traffic. In India, Landslides are main hazard which occur in most hilly and mountains areas, and also in vertical river banks and coasts. In India, the reasons of landslides are not vary from the world, but has some individualities. The main factors of landslides are: removing of lateral and underlying support result in the instability of Slope, uncritical cutting down of trees, Slash and burn agriculture activities in hills, construction of road and excavating activities, as we know the population is increasing day by day due to which there is need of grazing activities, suburbanization result as the reduction in the dense and evergreen forestry cover, through these actions of human, the environmental stability is disturbed, thus resulting in releasing of the soil under the circumstances of weighty rain.