DRRR

• • LANDSLIDE - A massive outward and downward movement of

  slope-forming materials
• • LANDSLIDE - A massive outward and downward movement of

  slope-forming materials
• GEOLOGICAL CAUSES - Weak or Sensitive materials Weathered materials

  Sheared, jointed, or fissured materials.
• . HUMAN CAUSES - Excavation of slope

  or its toe. Loading of slope or its crest, Deforestation, Irrigation, Mining, Water leakage from utilities.
• IMPENDING SIGNS OF RAINFALL INDUCED LANDSLIDE

  1. Unusual Noice Or MovemenT

  2. Changes In Groundwater Levels

  3. Cracks In The Ground

  4. Soil Saturation
• • SINKHOLE -an opening in the ground that is a result of dissolving of rocks beneath the surface of the land or the collapse of underground caves.
• • Sinkholes are common where the rock below the surface is limestone, dolomite, and gypsum.
• • Sinkholes form through a process known as KARSTIFICATION, which involves the dissolution of soluble rocks
• NATURAL SINKHOLES - Caused by physical and chemical erosion. Natural flow of water erode rock material while the acidic substance dissolve
• MAN-MADE SINKHOLES - Caused by drilling, mining, road construction and broken water pipe.
•  DISSOLUTION SINKHOLES - Rainfall and surface water percolate through joints in the limestone
• COVER COLLAPSED SINKHOLES

  • Also known as "drop-out" sinkholes

  Occur suddenly when the covering sediments collapse into an underground cavity.
•  COVER SUBSIDENCE SINKHOLES

  • These sinkholes form gradually as the ground subsides due to natural processes or human activities such as mining or Groundwater extraction.
• Geological Hazard Map - A geohazard map indicates areas that are susceptible to floods landslide, as determined by theMines and Geosciences Bureau (MGB)
• PARTS OF A GEOHAZARD MAP

  • Title

  • Legend

  • Orientation Compass

  • Map Ruler / Bar Scale

  • Coordinates

  • Boundary

  • Topography
• FOR RAIN INDUCED LANDSLIDE PRONE AREAS: 

  YELLOW – low susceptibility, less likely

  to experience landslide ; BE PREPARED
• FOR RAIN INDUCED LANDSLIDE PRONE AREAS: 

  GREEN – moderately susceptible; BE CAUTIOUS
• FOR RAIN INDUCED LANDSLIDE PRONE AREAS: 

  RED – highly susceptible; BE ALERT AND READY TO EVACUATE
• FOR FLOOD – PRONE AREAS

  PINK – low to moderately susceptible; BE CAUTIOUS
• FOR FLOOD – PRONE AREAS

  VIOLET – highly susceptible, BE ALERT AND READY TO EVACUATE
• MITIGATING GEOLOGICAL HAZARD

  • Taking action to reduce the risk of loss.
• HYDROMETEOROLOGICAL HAZARD - process or phenomenon of atmospheric, hydrological or oceanographic nature that may cause loss of life, injury or other health impacts, property damage, loss of livelihoods and services, social and economic disruption, or environmental damage. 
• 1. METEOROLOGICAL - study of the atmosphere and its phenomena, including weather and climate
• HYDROLOGICAL - Means water or water related process
• PAG – ASA - An agency that is responsible for assessing and forecasting weather, flood and other condition essential to the safety and welfare of the people.
• • An average of 20 tropical cyclones enters the Philippine Area of Responsibility (PAR) and 90 percent of them affect the country.
• TROPICAL CYCLONE - - An intense circular storm characterized by low atmospheric pressure, heavy rain and high winds in a counter–clockwise direction.
• HURRICANE - atlantic and northeast pacific
• TYPHOON - nortwest pacific
• CYCLONE - south pacific and indian ocean
• • Tropical cyclone activity is usually lowest in may and increases gradually through june.
• Activity then greatly increases from july until september, with the level of activity reaching its highest during August.
• • Come November, activity level eventually dies off.
• tropical cyclones form as a result of the atmosphere’s natural tendency to maintain equilibrium by redistributing heat through wind from the equatorial regions to the polar regions. 
• 1. STRONG WINDS - Strong winds, which cover a much larger area during tropical cyclones, cause the most obvious damage.
• 1. STORM SURGE - localized unusual increase of sea water level way above the predicted astronomical tide level, happens primarily due to intense winds and lowered atmospheric pressure that accompany intense tropical cyclones passing from the sea to the land.
• HEAVY RAINS - unlike strong winds and storm surges, actually occur in tropical cyclones of lower intensity.
• FLOOD - flooding is the abnormal rise of water level in rivers, coastal areas, plains, and in highly urbanized centers which may be a result of natural phenomena, human activities, or both. some areas, due to their location, land configuration, and climactic setting, are naturally susceptible to flooding.
• STORM SURGE - a storm surge is a localized unusual increase of sea water level beyond the predicted astronomical tide level primarily due to intense winds and lowered atmospheric pressure during the passage of an intense tropical cyclone from the sea to the land.
• Wind or pressure effect.

  • The stronger the wind of the tropical cyclone and the lower the atmospheric pressure, the higher the storm surge.