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Earthquakes and Landslides

Earthquakes and landslides are frightening and destructive natural disasters.

An earthquake is the sudden, rapid shaking of the earth caused by the breaking and shifting of rock deep underground. If an earthquake occurs in a populated area, it has the potential to cause many deaths and injuries along with extensive property damage. Although earthquakes are sometimes believed to be a West Coast phenomenon, there are actually 45 states and territories throughout the United States (including Pennsylvania) that are at moderate to high risk.

Landslides and debris flows occur in all U.S. states. In a landslide, masses of rock, earth or debris move down a slope. They can be activated by storms, earthquakes, volcanic eruptions, fires and human modification of land. Landslides and debris flows can move rapidly, striking with little or no warning at avalanche speeds. They also can travel several miles from their source, growing in size as they pick up trees, boulders, cars, and other materials.

Because of the suddenness and unpredictability of earthquakes and landslides, it is important for you and your family to prepare ahead of time.

Learn more about earthquakes and landslides in Pennsylvania from the Pennsylvania Department of Conservation and Natural Resources.

How to Prepare for Earthquakes

Get an emergency supply kit that includes enough provisions for you and your family to live on for a minimum of three days. Be sure to include plastic sheeting, duct tape and scissors in your emergency kit
Make an emergency plan for you and your family.

  • Know the important terms you may hear during an emergency:

  • Have a licensed professional repair defective electrical wiring, leaky gas lines, and inflexible utility connections (flexible fittings are more resistant to breakage).
  • Store breakable items such as bottled foods, glass, and china in low, closed cabinets with latches. Store weed killers, pesticides and flammable products securely in closed cabinets with latches and on bottom shelves.
  • Fasten shelves securely to walls. Place large or heavy objects on lower shelves. Anchor overhead lighting fixtures and hang heavy items such as pictures and mirrors away from beds, couches, and anywhere people sit.
  • Locate safe spots in each room under a sturdy table or against an inside wall. Hold earthquake drills with your family members so everyone knows what to do.
  • Be prepared for aftershocks that may follow the earthquake. Aftershocks are usually not as powerful as the main earthquake, but may cause additional damage and weaken structures.

What To Do During Earthquake

Below are tips for if you are indoors, outdoors, or in a moving vehicle during an earthquake.

How to Prepare for and Help Prevent Landslides

  • Be aware of changes in and around your home that could signal a landslide is likely to occur, such as changes in landscape and water drainage, or new cracks in foundations and sidewalks.
  • Follow proper land-use procedures. Avoid building near steep slopes or along natural erosion valleys. Land-use zoning, professional inspections and proper design can minimize many landslide, mudflow and debris flow problems.
  • Get a ground assessment of your property and, if necessary, consult a geotechnical expert for evaluating landslide hazards or designing corrective techniques to reduce landslide risk.
  • Minimize home hazards by having flexible pipe fittings installed to avoid gas or water leaks, as flexible fittings are more resistant to breakage (only the gas company or professionals should install gas fittings).

Landslide Warning Signs

  • Changes occur in your landscape such as patterns of storm-water drainage on slopes (especially the places where runoff water converges), land movement, small slides, flows or progressively leaning trees.
  • Doors or windows stick or jam for the first time.
  • New cracks appear in plaster, tile, brick, or foundations.
  • Outside walls, walks or stairs begin pulling away from the building.
  • Slowly developing, widening cracks appear on the ground or on paved areas such as streets or driveways.
  • Underground utility lines break.
  • Bulging ground appears at the base of a slope.
  • Water breaks through the ground surface in new locations.
  • Fences, retaining walls, utility poles, or trees tilt or move.

What to Do if There's a Landslide or Debris Flow

  • Move away from the path of the landslide or debris flow as quickly as possible.
  • If escape is not possible, curl into a tight ball and protect your head.
  • When the landslide ends, stay away from the slide area. There may be danger of additional slides.
  • Watch for associated dangers such as broken electrical, water, gas, and sewage lines and damaged roadways and railways.
  • Replant damaged ground as soon as possible since erosion caused by loss of ground cover can lead to flash flooding and additional landslides in the near future.