Volcano-Mt St Helens

Question 1

Location

Answer 1

Mt St Helens in Washington- Cascade Mountains

Question 2

Volcanic eruption

Answer 2

March 1980
5.1 earthquake followed by massive eruption
600km2 north of volcano covered in ash etc
Pyroclastic flows

Question 3

Economic impacts

Answer 3

$1.1 bil damage
200 homes and cabins destroyed
Airports closed
27 bridges, 24km of railways and 300km of roads destroyed

Question 4

Social impacts

Answer 4

57 killed
Hundreds lost homes
Unemployment rose at first but returned to normal after
People suffered emotional stress

Question 5

Environmental impacts

Answer 5

240km2 forest destroyed
7000 big game animals killed
12 million salmon killed
Sediment in Spirit Lake made it rise 60m

Question 6

Responses

Answer 6

Face masks for breathing in ash
Emergency shelters
Ash clean up operations 900,000 tonnes removed
45500 acres of land replanted=18.4mil trees

Question 7

Management before (GOOD)

Answer 7

The USGS monitored giving daily reports of bulge, ground temp, sulphur emissions
USGS warned people in danger sones
Volcano access restricted and evacuation
Day of eruption still surprise as no signs before