✔️Mt St Helens Volcanic Eruption Flashcards
When did Mt St Helens happen?
18th May 1980
Where is Mt St Helens?
Washington State, North West USA
Which plates were involved in Mt St Helens volcanic eruption and which plate boundary is it on?
Juan de Fuca meets the North American plate at a destructive margin.
How many years had Mt St Helens been active for prior to its eruption in 1980?
100
what did scientists warn about Mt St Helens in 1980?
That a large bulge which was developing on the snow-covered upper northern slopes of Mt St Helens might trigger an eruption.
5 immediate responses of Mt St Helens.
Search and rescue of survivors by helicopters.
Emergency medical treatment in nearby towns.
Shelters found for stranded tourists and those made homeless.
Masks provided to filter dust.
Roads cleared of ash, up to 1m deep in places.
4 long term responses of Mt St Helens.
Rebuilding of buildings , roads and homes.
Clear drainage channels, for example rivers.
Remove fallen trees and replant forests.
Attract tourists back to area- improve local economy.
How many people killed in Mt St Helens?
57
How many people made homeless in Mt St Helens?
250
6 short term effects of Mt St Helens.
Spirit lake filled. Salmon hatchery and logging camps destroyed. Roads and bridges washed away. Electricity and phone lines cut. Crops ruined. Every tree in 250km 2 destroyed.
Mt St Helens on the Richter Scale?
5.4
5 long term effects of Mt St Helens.
Loss of farming income as 12% of crops ruined and all vegetation destroyed.
Small eruptions continued until 1986.
Access to area was difficult due to destruction of infrastructure.
Tourism effected.
Costs for repairs reached $2.74 billion, (about £2 million)
Is Mt St Helens a MEDC or a LEDC?
MEDC
