DRRR 1

• Geological hazards are natural phenomena that cause major problems all over the world.
• The expansion and development of cities lead to an increase in impact and damage due to geological hazards.
• In general, most of the geological hazards are related to natural conditions although some may be due to human activities.
• A landslide, also called "landslip", is a massive outward and downward movement of slope forming materials.
• The term landslide is restricted to movements of rocks and soil masses.
• These masses may range in size up to entire mountainsides. Their movements may vary in velocity.
• A landslide is initiated when a section of a hill slope or sloping section of a sea bed is rendered too weak to support its own weight.
• This is generally triggered by other hazards such as generally natural prolonged, heavy rainfall or by other sources of water which increase the water content of the slope materials.
• Landslide can be caused by: Volcanic Eruption Soil erosion Heavy Rainfall
• Landslide can either move very slowly like some millimeters per year. It could also be disastrously fast. Sometimes more than 100 miles per hour
• Landslides cause property damage, injury and death and adversely affect variety of resources. WATER SUPPLIES

  FISHERIES

  SEWAGE DISPOSAL SYSTEMS

  FORESTS

  DAMS AND ROADWAYS
• Avoid building houses near Steep Slopes or at the edges of mountains.
• Stay away from drainage paths because water flow increases the speed of landslides.
• Sinkholes are common where the rock below the land surface is limestone carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them.
• Sinkholes are dramatic because the land usually stays intact for a while until the underground spaces just get too big.
• A topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum.


  Karst
• It is characteritzed by underground drainage systems with sinkholes and caves.


  Karst
• Warning signs


  Trees or fence posts that tilt or fall

  Foundations that slant

  Cracks in the ground

  Sudden drainage of a pond

  Cracked tiles

  Uneven floors and warping of hardwood

  Doors or windows that don't open or close easily
• If there is not enough support for the land above the spaces then a sudden collapse of the land surface can occur.


  Sinkhole
• As the rock dissolves, spaces and caverns develop underground.


  Sinkhole
• Landslides are also aggravated by human activities, such as:

  Deforestation, cultivation and construction, which destabilize the already fragile slopes. Vibrations from machinery Construction works, or forestry activities.
• TOP 10 LANDSLIDE PRONE PRO IN THE PROVINCES PHILIPPINES

  Marinduque Rizal

  Cebu

  La Union

  Southern Leyte

  Benguet

  Nueva Vizcaya

  Batangas

  Mountain Province

  Romblon