Mount St Helens Flashcards
This deck covers key facts about Mount St Helens and the basics outlines of the case study.
How many people were killed during the Mount St Helens eruption?
57 people were killed
When did the Mount St Helens eruption happen?
Sunday 18th May 1980 at 8:30 am
What was the magnitude of the earthquake leading to the eruption of Mount St Helens?
5.1 on the Richter scale
What was the main cause of of Mount St Helens being so destructive and exceeding blast radius expectations?
A bulge formed on the northern flank of the volcano, and when the earthquake occurred it ruptured and led to a landslide of super heated materials
What was the overall cost of the Mount St Helens after it had erupted?
$1 billion
What was the VEI of Mount St Helens?
5
How many people were evacuated before the Mount St Helens eruption?
2000 people were evacuated, even though many went back into the danger zone the day before to collect belongings.
How much land was destroyed as a result of the Mount St Helens eruption?
230km squared of forest was last
What percentage of crops were lost after the Mount St Helens?
12% of crops in the area were destroyed and 100,000 logs swept away
Out of 32 species native to the habit around the Mount St Helens volcano how many survived?
14 species survived
How much was the cost to clean up Mount St Helens post eruption?
$250 million
What were the convergent plate boundaries of Mount St Helens?
The Oceanic Juan de Fuca plate subducting under the Continental North American plate
What caused the destruction of 200 homes, 27 bridges and 185 miles of road in Washington?
A lahar, that was formed by the melting of snow mixing with the ash plume
In what way did the American government respond to the eruption of the 1980 Mount St Helens volcano? (3 main ways)
- Replanting 10 million trees
- Redesigning bridges to be wider and prevent blockages
- Advances in geological technologies like robotics and satellite imaging
What is the GDP per capita ($) of the United States of America?
$49000
