DRRR 2

• Warning signs of an impending landslide


  • Earlier landslide as indicator
  • Tension cracks
  • Things moving
  • Water doing something different
• Earlier landslide as indicator


  1. Frequent occurrence of landslides in a section

  2. Soil in this area is weak and has unstable geology

  3. More susceptible to landslides

  4. Caused by lack of vegetation, weathering, erosion, etc.

  5. Multiple landslide events within the same place are retrogressive, piecemeal, or reactivated

  6. A reactivated landslide is when an old, semi-stable landslide changed something, causing a new collapse at the same place

  7. Inspecting an area of an old landslide for scarps and deposits is a clear indicator that a landslide will reactivate
• Tension cracks


  • Caused by the stress and friction produced by geologic materials moving apart which forms steep lines of cracks in the terrain
  • Tension cracks above an existing landslide can hint at a future reactivation
  • These cracks are located on higher elevated ground
  • Cracks that are found on flat terrain are caused by fault movement and not landslide indicators
• Things moving


  • Deformation and movement of non-living objects not caused by human manipulation
  • Trees bending up in a J-curve as a sign that the ground slips out from underneath them
  • A patch of angled forest on a slope or J-curved trees somewhere can be a good indicator that the ground is less solid than it seems
  • No longer closing properly, or broken utilities
  • Rapid landslides are results of sudden collapse of a slope
  • Indicators of slow landslides are categorized by movement of floor tiles, deformation of door frames which causes difficulty in closing and opening the door, and broken electric posts, gas, water and sewage pipes
  • Creaking and cracking can also be warning signs
• Water doing something different


  • Obvious changes in water flow
  • Springs, seep, or wet ground may appear on a seemingly dry terrain
  • Unexpected withdrawal of water also indicates the same
  • Water causes alteration of the pressure within the slopes of a terrain
  • A debris flow is a very wet, very mobile landslide, where water is loaded with trees, mud, rock, and everything else caught in the current
  • Low water level precedes the arrival of the debris flow surge
• Warning signs of an impending sinkhole


  • Trees or fence posts that tilt or fall
  • Foundations that slant
  • New small ponds that appear after rain
  • Cracks in the ground
  • Sudden drainage of a pond
  • Rapid appearance of a hole in the ground
  • Dips, depressions, slopes that appear in a yard
  • Dead patches of grass or plants
  • Sinkholes in the neighborhood
  • Wilted vegetation in a limited area
  • Well water that is discolored or contaminated with debris
  • Cracking or buckling of home's concrete slab
  • Presence of odd bugs like slugs, centipedes in homes
  • Earthly odor in home after rain
  • New or widening cracks
  • Separation between walls and ceiling or floors
  • Cracks around door and window frames
  • Cracked grout between tiles
  • Cracked tiles
  • Stair step cracks in blocks or bricks
  • Uneven floors, warping of hardwood, bulging or sagging sections
  • Doors or windows that don't open or close easily
  • Cracks in sheetrock near doors or windows
• All homes are subject to some settling characteristics. Signs of an impending geologic hazard may or may not always cause a landslide or a sinkhole. Still, two or more of these signs may indicate something wrong happening in the area, which alerts people to be careful of possible dangers that it may cause.
• Retrogressive


  Multiple landslide events within the same place
• Piecemeal


  Multiple landslide events within the same place
• Reactivated


  Multiple landslide events within the same place
• Tension cracks


  Created by the stress of geological material pulling apart
• Crooked trees


  A patch of angled forest on a slope
• Debris flow


  A very wet, very mobile landslide, where water is loaded with trees, mud, rock, and everything else caught in the current