DRRR

• Geological hazards


  Natural events in the crust
• Landslides


  Movement of debris rocks in the earth in the downslope
• Rainfall-induced landslide


  • Type of landslide incorporated with water
• Sinkhole


  Occurs below the surface that eventually collapses
• Some geologists call it "karst terrain"
• Common rocks that are dissolved in this is limestone
• Major types of sinkholes

  • Solution sinkhole
  • Cover collapse sinkhole
  • Cover subsidence sinkhole
• Solution sinkhole


  • Most common sinkhole, the soil is very thin on the surface and bedrock is exposed
• Cover collapse sinkhole


  • Most dangerous type, where water penetrates going to limestone then dissolved until the surface collapses
• Cover subsidence sinkhole


  • With a surface sand moved downward to replace the dissolved limestone