Plate Tectonics Case Studies-Mount St Helens Flashcards

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1
Q

Where

A

Washington, USA, Cascade Mountains

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2
Q

What

A

Volcanic eruption, pyroclastic flows, Lahars and floods

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3
Q

When?

A

18th May 1980

Signs in march, small earthquakes, bulge on side, ash/steam released

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4
Q

Why

A

Destructive plate boundary, Juan de Fuca plate under North American plate

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5
Q

Type

A

Composite

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6
Q

Impacts

A

Cost of $1.1 billion.
200 homes destroyed
1000 flights cancelled
Airports closed 2 weeks

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7
Q

Impacts

A

57 killed,
Timber industry suffered
Unemployment
Hundreds lost homes

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8
Q

Impacts

A

27 bridges, 24km railway, 300km road destroyed

31 ships stranded-mudflows

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9
Q

Responses

A

Face masks, reduced ash intake
Emergency shelters
Ash cleanup organisations

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10
Q

Responses

A

More trees replanted, 18.4 million over 45,500 acres
Shipping channels cleared
Water monitored

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