MEDC Volcano - Mt St Helens Flashcards
How many were killed
57 people
Causes
5.1 magnitude earthquake
Date
May 18th 1980
What time was eruption and why is that important
6am, not many people around the volcano as asleep
how many houses destroyed
250
what was destroyed
roads crops fish habitat in Spirit Lake logging camps bridges
what was the problem with ash clouds spreading 100s of miles away
air traffic was interupted
how many animals were killed
7 million, all in 25km blast radius
what caused most damage
pyroclastic flow in 100 square miles radius wiping out trees into lake
largest landslide recorded in history (side of mountain collapsed)
laharrs washed away people and buildings
the mountain reduced in size by…
1500ft
short term responses
- people given masks to prevent ash inhaling
- roads repaired and bridges rebuilt
- ash cleared from properties
- Helicopters searched for survivors
long term responses
Afforestation and vegetation regrows on fertile ash
designated a national monument to generate tourist income (logs in Spirit lake as attraction.)
