Mount St Helens, USA, MEDC Volcanic Eruption

Question 1

When did the volcano erupt?

Answer 1

May 18th 1980

Question 2

What plate boundary is the volcano found on?

Answer 2

Found above a destructive plate margin, where the Juan de Fuca plate is being forced under the North American plate

Question 3

What type of volcano is it?

Answer 3

Composite

Question 4

What was the magnitude of the volcano?

Answer 4

5.1

Question 5

What area did the eruption cover?

Answer 5

600km2 north of the blast

Question 6

What was destroyed in the blast zone?

Answer 6

Almost all vegetation and buildings, which spread 30km away from the volcano

Question 7

Another eruption followed the initial eruption, how many tonnes of ash were deposited?

Answer 7

540 million tonnes and it covered an area of 57,000km2

Question 8

What was the cost of damage?

Answer 8

$1.1 billion

Question 9

How many homes were destroyed?

Answer 9

200

Question 10

How many flights were cancelled?

Answer 10

Over 1000

Question 11

How many bridges were destroyed?

Answer 11

27

Question 12

How many kilometres of road and railway were destroyed?

Answer 12

24km of railway and 300km of roads

Question 13

How many people died?

Answer 13

37 due to ash

Question 14

How high did unemployment rates increase?

Answer 14

10x

Question 15

How many kilometres of forest were destroyed?

Answer 15

240km2

Question 16

How many animals were killed?

Answer 16

7000 game animals, 12000 salmon

Question 17

Sediment in Spirit Lake had the following effects…

Answer 17

Raised the lake bottom by over 90m and water level over 60m

Question 18

What did the USGS (United States Geological Survery) start doing in March?

Answer 18

Round the clock monitoring

Question 19

How many people were evacuated?

Answer 19

2000 however prediction was not very accurate