Mount st Helens
- Created by: EllaMcNicholl14
- Created on: 01-06-17 18:43
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Key facts:
- Mount st Helens in Washington is one of the volcanic peaks in the cascade mountains
-cascade mountains- above destructive plate margin, Juan de fuca plate forced under north american plate
-composite volcano
-1980 March-signs of an eruption including earthquakes, bulge on side of volcano, ash and steam
-1980,18th May- large earthquake, magnitude of 5.1, a massive eruption of volcanic material
-eruption covered 600km north of volcano-the blast zone
-all vegetation/buildings destroyed in blast zone-30km
-pyroclastic flows, lahars, floods
-eruption of ash/steam-540 million tonnes of ash
Economic impacts:
-total cost of damage-$1.1 billion
-200 homes/cabins destroyed
-airports temporarily closed due to…
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