Landslides

A landslide is the downward movement of rock, earth, or debris on a slope. It can be triggered by heavy rainfall, earthquakes, wildfires, volcanic activity, or construction disturbances. Landslides may occur suddenly (debris flows or mudslides) or gradually (slumping and slow earth movement), and they can bury homes, block roads, sever utilities, and cause fatalities.

Areas prone to landslides include:

  • Hillsides in wildfire burn scars
  • Steep mountain or canyon terrain
  • Riverbanks or coastal cliffs
  • Areas with recent excavation or deforestation

Warning Signs

  • Cracks in soil, driveways, or foundations
  • Tilting trees or utility poles
  • Unusual seepage or springs on slopes
  • Sticking doors or windows
  • Sudden change in water runoff pattern
  • Faint rumbling or unusual sounds

Preparedness Tips

Before a landslide

  • Know if your home is in a landslide-prone area (check with local geologic or planning department)
  • Plant deep-rooted vegetation to stabilize soil
  • Redirect drainage away from slopes
  • Avoid adding weight (e.g., pools or water tanks) on top of steep areas
  • Install retaining walls or erosion barriers where appropriate
  • Maintain emergency communication and evacuation routes

Emergency kit additions

  • Waterproof boots
  • Gloves and dust masks
  • Shovel and rope
  • Personal protective gear if near debris zones

During a Landslide

If indoors:

  • Move to a higher floor if possible
  • Shelter under a sturdy piece of furniture
  • Stay away from windows and exterior walls
  • Listen for emergency warnings or evacuation orders

If outdoors:

  • Move quickly uphill and away from the path of the slide
  • Avoid river valleys and low points where mud can accumulate
  • Never cross flowing mud or debris—it can move faster than you think

After a Landslide

  • Stay away from the slide area—secondary slides may occur
  • Report damaged utilities or gas leaks
  • Avoid using roads until cleared by authorities
  • Photograph damage for insurance
  • Be cautious of contaminated water and unstable ground

Key Resources

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