Mount St. Helens eruption

Question 1

Where was the eruption

Answer 1

Washington state, USA

Question 2

When was the eruption

Answer 2

march 27th 1980

Question 3

What did the explosion cause

Answer 3

–> lahars
–> pyroclastic flows
–> jokulhlaups
–> ash clouds
–> volcanic bombs

Question 4

what were the impacts

Answer 4

–> $1 billion damage ($3.4 million in 2023)
–> 25km around volcano reduced to wasteland
–> 57 killed
–> 1000s of animals killed
–> volcano left with crater in its size
–> volcanic debris deposited in rivers and townsh

Question 5

what caused the eruption

Answer 5

–> injections of magma into the north side of the volcano created a bulge
–> an earthquake caused the weakened north face to collapse + build of pressure caused an explosion - also caused a landslide
–> subduction og Juan de Fuca under the north American plate