mt st helens

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  • Mt St Helens- Washington USA -1980
    • General information
      • lies near to a destructive plate boundary
      • part of the Cascade mountain range
    • Environmental impcts
      • Spirit lake filled in by landlside
      • flood risks were increased
      • 250km2 of forestry was destroyed
      • 250km of river ecosystem destroyed by lahars
  • trigger stimulus was a small earthquake
    • this caused a bulge which became unstable and collapsed
    • General information
      • lies near to a destructive plate boundary
      • part of the Cascade mountain range
  • Social impacts
    • communications disrupted
    • 56 people died
    • lahars destroyed 200 homes
    • 27 bridges, 185 miles of road and 15 miles of railway destroyed
  • Responses
    • helicopters flew in
    • ash was cleared from towns
    • the big rivers were dredged
    • new tourist facilities built
    • volcano monitored
    • houses rebuilt
    • new plans to prepare and warn people
    • exclusion zone was set up
    • bridges rebuilt with a wider span
    • Mt St Helens- Washington USA -1980
      • Environmental impcts
        • Spirit lake filled in by landlside
        • flood risks were increased
        • 250km2 of forestry was destroyed
        • 250km of river ecosystem destroyed by lahars

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