Mount St. Helens, USA, MEDC Volcanic Eruption Flashcards
What date did the volcano erupt?
May 18th 1980
On what kind of plate margin is this volcano found?
Destructive (Juan de Fuca plate is being forced under the North American plate)
What kind of volcano is Mt St Helens?
Composite Volcano
How much area did the eruption cover?
600km2 north of the blast
How big was the ‘blast zone’ in which almost all vegetation and buildings were destroyed?
30km
An earthquake measuring what magnitude caused the eruption?
5.1
540 million tonnes of ash was deposited over an area of…?
57,000 km2
What organisation helped to make the clean up operation efficient due to good training?
FEMA
What was the cost of the eruption?
$1.1 billion
How many homes destroyed?
> 200
How many commercial flights cancelled?
> 1000
How many deaths caused by ash?
57
How much forest was destroyed?
240km2
How much ash was cleared from the roads?
900,000 tonnes
When earthquakes began in March who started round the clock monitoring?
United States Geological Survey (USGS)
