Mt St Helens Casestudy Flashcards

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0
Q

What was the tectonic setting?

A

Converging plate boundary

The Fuca plate was sub ducted under the North American plate.

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1
Q

How many people were killed?

A

57

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2
Q

When did Mt St Helens erupt?

A

18th May 1980

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3
Q

What was the environmental impacts?

A

Deforestation of 3000 acres.
Only 14 out of 32 species in the area survived.
Over 250km of river ecosystem was destroyed.

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4
Q

What was the economic impacts?

A

Eight bridges were destroyed.
12% of total crops in the area were damaged or destroyed.
Clean up cost $250 million

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5
Q

What were the social impacts?

A

Lahars destroyed 200 homes, people suffered from post-traumatic stress, and 57 deaths.

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6
Q

Management?

A

Overall 2000 people were evacuated from the area.
Shut roads close to the volcano.
Gas readings at fumaroles to check for raised sulphur and chlorine levels.

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7
Q

Immediate responses?

A

Helicopter rescue mission took place for 2 weeks rescuing 130 people.
2 million gas masks were provided.

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8
Q

Long term responses?

A

Over 10 million trees were replanted.
New equipment installed to monitor the volcano at all times. (Satellite, spider robots)
Bridges rebuilt with a wider span to avoid future road blocks.

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