Drrr quiz 1

• Rainfall-induced landslide - it is a result of prolonged rainfall that pushes the soil cover to collapse and causes landslide
• Rainfall-induced landslide - the movement along the sliding surface of land leads to the crushing of soil grains, which causes liquefaction of the soil surface.
• Rainfall-induced landslide - it is the incidence of landslides is restricted basicallyby geological circumstances, morphological conditions, land cover conditions, and other related situations
• Landslides are dangerous because the earth slides down to the lower ground and contains a heavymass of mud that can sweep off properties and bury people.
• warning signs of rainfall-induced landslide

  • Water springs from the ground where there used to be none is a sign that the ground is soaked with so much water
  • Unusual bulges and cracks on the ground, road, or sidewalks
  • Cracking of floors or tilting of building foundations
  • sunken roads
  • Unusual cracking of trees or boulders which could be an indication of eroding soil, or slow movements of debris.
  • A rapid increase in creek level with signs of large quantities of soil contamination.
• Mitigation measures against rainfall-induced landslide

  • Do not build structures near steep slopes, close to mountain edges, drainage channels, or natural erosion valleys.
  • Before building any structure, get professional help from engineers.
  • Study the pattern of rainwater flow around your area.
  • Plant grass and trees on slopes and build retaining walls
  • Build drainage systems, water channels, or deflection walls to divert the flow of water and mud.
  • signs must be placed along the road known to be prone to landslides
• what to do in the event of a possible rainfall-induced lanslide

  • pay attention to the weather bulletin
  • Prepare your disaster supply kit: water,clothes, flashlight, matches, candles, canned food,etc
  • Listen for any unusual sound that might indicate moving debris, such as the cracking of trees and boulders
  • If you live a near water channel, pay attention to the sudden increase or decrease of water flow.
  • If the local government had declared your area in danger from a landslideand advices you to proceed to evacuation centers, heed their advice.
• what to do after rainfall-induced landslide

  • Stay away from landslide areas as there may be more slidesto happen.
  • Stay away from landslide a Listen to the radio for further notice about the weather as there may be more slidesto happen.
  • Watch out for possible flooding
  • Check for trapped or injured people near the slide. Direct professional rescuers to their locations.
  • Look for and report broken power lines, fallen poles, and damaged roads to appropriate authorities.
  • Check the foundation of houses and buildings where the slide happened.
• Sinkhole - Also known as "wallet snake hole" and is a natural hole on the earth's surface
• Sinkhole - caused by the chemical dissolution process in sandstone or the chemical dissolution of carbonate rocks that causes erosion of the soil beneath the ground.
• Sinkhole - may form suddenly and gradually
• Sinkhole - can be also a result of some human activities such as mining and over- extraction of subsurface fluids like groundwater
• Sinkhole - some are due to the substantial weight of material on top of the ground which can trigger the underground collapse of bedrocks
• Sinkholes are dangerous because these can take lives in an instant. They can occur without warning. People, houses, and establishments can be destroyed.
• Solution sinkholes - common in areas where there is very thin soil cover. Water erodes the area gradually creating bowl-shaped depressions.
• Cover-collapse sinkholes - develop abruptly (over a period of hours) and cause catastrophic damages.
• Cover subsidence sinkholes

  • form over a long period of time
  • this usually happend when sand mostly covers the bedrock
  • the sand subsides through openings in the bedrock creating holes
• things to do when there is a sinkhole before

  • Before purchasing a land or house,do research first if the area is prone to the occurrence of sinkholes.
  • Practice bringing a whistleevery day as this can serve as your signaling device in case of beingtrapped in sinkholes
  • If you are already living in an area where is a frequent occurrence of sinkholes, consider leavingthe area and moving to a safer place.
• things to do when there is a sinkhole during

  • When you are trapped in a sinkhole, try to make noise but don't tap or dig the soil and rocks around you because there may be a possibility that your movement will create soil erosion again.
  • If you have a cellphone and if you can still move, move slowly and carefully. Get your mobile phone and call for rescue
  • Stay calm no matter what happens. Save your body energy and wait for people who willpass by the sinkhole. Once it happens,call them for help.
• things to do when there is a sinkhole after

  • If you were caught in a sinkhole and you were able to escape it, check yourself for injuries and immediately seek help and report what happened to the authorities.
  • if you discover a sinkhole, report it immediately to the authorities.