Volcano Case Study Flashcards
What is our volcano case study
Mt. St. Helens
When was the first sign of activity
Spring 1980
When did the eruption take place
18 may 1980
What plate boundary does Mt. St. Helens lie close to and what type of boundary is it
It lies close to a destructive boundary where the smaller Juan de Fuca plate is being forced under the larger North American plate
The mountain was reduced from a height of __________ to a height of __________
2950m / 2560m
All ____________________ within a _______ radius was killed
Plant and animal life / 25km
What happened to the rivers
They where flooded and filled with debris
What do the mudflows do
Choke rivers filling them with debris
Killed fish
Ripped trees from their roots
How many people died
61
How many people were rescued
198
What did the mudflows destroy
Bridges
Houses
Logging companies
What did the explosion do
Flatten buildings and trees
Knocked out power supplies and telephones
Why where airline flights cancelled
Ash clouds
What was the cost of the damage
£100 million
