A landslide or landslip is a geological phenomenon which includes a wide range of ground movements, such as rockfalls, deep failure of slopes and shallow debris flows, which can occur in offshore, coastal and onshore environments. Although the action of gravity is the primary driving force for a landslide to occur, there are other contributing factors affecting the original slope stability.
Step 1: Causes
• erosion of the toe of a slope by rivers or ocean waves
• earthquakes adding loads to barely stable slope
• volcanic eruptions