Volcanic eruption Case Study


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Location of volcano?
Mount St Helens, Cascade range, Washington state, North West America
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When did the eruption happen?
18th May 1980 at 8:32 am
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What caused the eruption?
Magnitude 5.1 earthquake caused landslide which in turn triggered the eruption.
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What were the primary effects?
57 deaths; 250 homes destroyed; 7000 animals died; 230miles squared of trees were flattened
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What were the secondary effects?
Timber industry destroyed; tourist industry declined; cost of damage to farmers machinery and crops totalled $100 million
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What were the immediate responses?
Rescuing stranded people; providing shelter for those who lost their homes; giving medical supplies to injured; rescued 198 people.
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What were the long-term responses?
Removing ash from roads, rebuilding highway, rebuilding homes, dredging river.
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What were the positive impacts?
Area became very fertile years later, tourist industry grew rapidly once facilities were set up due to geographical interest.
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What were the negative impacts?
15cm of ash fell causing traffic chaos and airline flights to be cancelled; water produced form melting sno and ice caused mud flows which filled spirit lake and killed 12 million salmon
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Other cards in this set

Card 2

Front

When did the eruption happen?

Back

18th May 1980 at 8:32 am

Card 3

Front

What caused the eruption?

Back

Preview of the front of card 3

Card 4

Front

What were the primary effects?

Back

Preview of the front of card 4

Card 5

Front

What were the secondary effects?

Back

Preview of the front of card 5
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