Types of landslides:

(1) Fall: It includes free fall and rolling of rocks and debris down the hill slope.

(2) Slide: It is the movement of slope forming materials along one or several surfaces down the hill slope. It is caused due to finite shear failure of rocks.

(3) Flow: It is the movement of the slope forming materials within the displaced mass. The form taken by the moving materials resembles to that of viscous fluid. In this case, the slip surface cannot be located.

(4) Complex land slide: It includes movement due to combined effect of tow or more types of landslides.

Causes of landslides: The following are the causes of landslide:

1) Due to increase in water content during rainy season.

2) Due to Hair-cracking due to alternate swelling and shrinkage of the soil mass.

3) Due to increase in load due to traffic or accumulation of snow on the road surface.

4) Due to removal of part of the mass by excavation and increase in slope angle.

5) Due to undermining caused by erosion.

6) Due to shocks and vibration caused by earthquake and nearby blasting or rocks.

7) Due to formation of faults in bedding planes of the strata due to vibrations.

8) Due to fissuring of pre-consolidated mass due to release of lateral pressure while doing cutting of rocks.

9) Due to seepage pressure of percolating ground water.

10) Due to failure of retaining wall or breast wall