Mt St Helen's Volcanic Eruption Flashcards
What is our case study for a volcanic eruption in an MEDC?
Mt St Helen’s.
When did signs of impending eruption begin??
In March 1980.
What happened before the volcanic eruption?
First there was earthquakes then steam filled with ash exploded on the glacial summit of the mountain.
What were locals told to do?
Evacuate the area and they were not alloud inside an 8km exclusion zone around the crater.
When did the eruption happen?
18th may at 8;32am.
What happened on the north east side of the mountain?
An earthquake measuring 5.1 on the richter scale caused a landslide on the north east side of the mountain.
What type of volcano is mt st helens?
Composite volcano.
What plate boundary did it happen at?
Destructive plate boundary.
Where did it happen?
Mt St Helen’s is located in the very north of the USA near the border of canada in Washington state.
It is in the cascade Mountain Range.
Part of the Pacific Ring of Fire.
How high was mt st helens?
It was nearly 10,000 feet high but an eruption blew the top of it causing a redution ov over 1,000 feet.
How many people were killed?
Is this a short term effect or long term effect?
57.
Short term effect.
How many homes destroyed?
Is this a short term effect or long term effect?
250 homes.
Short term effect.
What lake was involved?
Is this a short term effect or long term effect?
Spirit lake it was filled with debris.
STE.
Name 2 things which were destroyed?
Is this a short term effect or long term effect?
Salmon Hatchery.
Logging camps.
STE.
Name 2 things which were washed away?
Is this a short term effect or long term effect?
Roads and bridges.
STE.
Name 2 things which were cut out?
Is this a short term effect or long term effect?
Electricity and phone lines cut out.
STE.
What was ruined?
Is this a short term effect or long term effect?
Crops.
STE.
What happened to trees?
Is this a short term effect or long term effect?
Every tree destroyed in a 250km2 radius.
Flooding happened due to what?
Lahars.
Lava mixed with ice and snow from the mountain causing mud slides.
What were the earthquakes on the richter scale?
5.1.
12% of crops destroyed resulted in what?
Is this a short term effect or long term effect?
Loss of farming income.
Long term effect
What did all vegetation mean?
Is this a short term effect or long term effect?
Left no food for animals such as deer and bear.
Long term effect.
When did small eruptions happen until?
Is this a short term effect or long term effect?
1986.
LTE.
What was the cost for repair?
$2.74 billion
Search and rescue of survivors by what?
Helicopters.
Immediate response.
