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
Step 2: Landslides are aggravated by human activities, such as:
• vibrations from machinery or traffic
• earthwork which alters the shape of a slope, or which imposes new loads on an existing slope
• Construction, agricultural or forestry activities (logging) which change the amount of water which infiltrates the soil.
Step 3: Before a Landslide
• To begin preparing, you should build an emergency kit and make a family communications plan.
• Become familiar with the land around you. Learn whether debris flows have occurred in your area by contacting local officials. Slopes where debris flows have occurred in the past are likely to experience them in the future.
• Get a ground assessment of your property.