Case study- Mount St Helens

Question 1

When did the mount st helens eruption occur?

Answer 1

May 1980

Question 2

what was the secondary hazard caused by the eruption of st helens?

Answer 2

Biggest volcanic landslide in historical time

Question 3

Name two ways in which the US government predict volcano eruptions?

Answer 3

• Draw up hazard maps and monitor gas emissions
• Ground deformation measured by GPS
• Seismometers record the magnitude of earth movements

Question 4

how was the Mount St Helens eruption predicted?

Answer 4

Harmonic tremors of continuous rhythmic earthquakes often precedes volcanic eruptions

• Ash eruptions were monitored
• North flank of the volcano started to bulge

Question 5

how were the people of the area around st helens prepared for the eruption?

Answer 5

• People not allowed within 13km of the summit

- emergency evacuation plans were made for communities down the valleys

Question 6

how far did the st helens landslide travel and why did it travel so far?

Answer 6

22km- melted snow and ice from the glaciers on the slopes of Mount St Helens made the material more liquid

Question 7

how many people died?

Answer 7

57-only people that refused to leave the area

Question 8

what were the mental impacts on the people living near st helens?

Answer 8

PTSD