Geologic Hazard

• Geologic Hazard - is geological process or phenomenon that may cause loss of a life, injury or other health impacts,

  property damage, loss of livelihoods and services, social and economic disruption, or environmental damage.
• Geological hazards - are responsible for great loss of life and destruction of property.
• Landslide - is a geological phenomenon which includes a wide range of ground movement, such as rock falls, deep failure

  of slopes and shallow debris flows, which can occur in offshore, coastal and onshore environments.
• A landslide, also called "landslip", is a ground movement on a sloping

  terrain. Landslides do not happen on flat grounds.
• Natural Causes of Landslides

  • Earthquakes

  Seismic activities have always been a main cause of landslides throughout the world. When earthquakes occur on areas

  with steep slopes, oftentimes the soil slips causing landslides. Furthermore, ash and debris flows caused by earthquakes

  may also trigger mass movement of soil.

  • Heavy Rainfall

  When sloped areas become completely saturated by heavy rainfall, landslides may occur, Without the aid of mechanical

  root support the soil simply runs off when it contains too much water.
• Human Causes of Landslides

  • Clear Cutting

  This method is hazardous because it destroys the existing mechanical root structure in the area.

  • Mining

  Mining operations that use blasting techniques often cause other areas that are at the risk of sliding to slide due to

  vibrations under the soil.
• Slope movement - occurs when forces acting down-slope (mainly due to

  gravity) exceed the strength of the earth materials that compose the slope.