A LANDSLIDE is a movement of slope-forming materials in the form of rocks, weathering products, earth, or combinations of such materials, down or out of the slope. According to head of the geological agency Raden Sukhyar, a landslide can be due to several factors.

The first is the geological factor, involving rock structures and soil conditions. Earth will tend to slide if its rock cover is loose and moves. The second is the gradient of a slope,