Mount St Helens USA
- Created by: rachel_tsangx
- Created on: 13-04-17 10:48
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- Mount St. Helens, Cascades 1980
- Secondary Effects
- Ash encircled world in a few days
- Ash blocked rivers- fish dead and flooding
- Flooding destroyed infrastructure
- Electricity supplies and telephone wires cut
- 12% crops ruined
- Flooding destroyed infrastructure
- Causes
- Earthquake 5.0
- Minor earthquake tremors- north face bulge
- Destructive
- Juan de Fuca subducting under North American
- Primary Effects
- Ash and Steam erupted
- Lahars covered 24 squared miles
- 200 homes destroyed
- Forestry destroyed
- Log jam 60km away
- 57 deaths- poisonous gases
- Logging camps destroyed by Nuee Ardents
- Lahars covered 24 squared miles
- Ash and Steam erupted
- Primary Responses
- Ash cleared in 3 days
- 2 million gas masks provided
- Evacuated people
- National Guard
- Helicopters
- 130 people rescued
- Supplies
- Medical
- Temporary Shelter
- Clean Water
- Food
- Helicopters
- Secondary Responses
- Rivers dredged- logs removed
- Infrastructure repaired
- Homes rebuilt
- 10 million trees replanted
- Farmers received compensation
- Volcano now being monitored
- Secondary Effects
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