Plate Tectonics Case Studies-Mount St Helens Flashcards
1
Q
Where
A
Washington, USA, Cascade Mountains
2
Q
What
A
Volcanic eruption, pyroclastic flows, Lahars and floods
3
Q
When?
A
18th May 1980
Signs in march, small earthquakes, bulge on side, ash/steam released
4
Q
Why
A
Destructive plate boundary, Juan de Fuca plate under North American plate
5
Q
Type
A
Composite
6
Q
Impacts
A
Cost of $1.1 billion.
200 homes destroyed
1000 flights cancelled
Airports closed 2 weeks
7
Q
Impacts
A
57 killed,
Timber industry suffered
Unemployment
Hundreds lost homes
8
Q
Impacts
A
27 bridges, 24km railway, 300km road destroyed
31 ships stranded-mudflows
9
Q
Responses
A
Face masks, reduced ash intake
Emergency shelters
Ash cleanup organisations
10
Q
Responses
A
More trees replanted, 18.4 million over 45,500 acres
Shipping channels cleared
Water monitored
