Mt St Helens volcano Case study

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  • Created on: 05-05-11 19:03
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Case Study Location: Washington State, North West USA
Name:
Mt St Helens
Use of the
Case Study A case study of a volcanic eruption- its Rich
cause; primary and secondary effects;
positive and negative impacts;
immediate and long term responses.
Key facts
and 18th May 1980 eruption, destructive
figures: plate margin, 57 killed, 200m thick mud
flow, Toutle river blocked, Spirit Lake
filled in
Remembe
Primary Pyroclastic flow- destroyed forests and ring the
Effects logging camps Case
57 killed by poisonous gas, Lahars Study
covered the area around the volcano (Picture,
Mudflow (200m thick) Phrase,
poem,
rap etc.)
Secondary -Ash blocked rivers (Toute River)
Effects destroying popular fishing sites and
caused floods.
-Spirit Lake in filled
-Crops and live stock killed
Tourism has increased, boosting the Negative Loss of life (57 killed)
local economy (3 million visitors a year) impact:
Positive Loss of infrastructure
impacts Volcano now more closely monitored
Loss of forestry and fishing
Soil fertility increased

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Immediate Helicopters search and rescue Long term Communications such as roads and
response Evacuation & exclusion zone response bridges repaired
People re-housed
Dust masks issued by the governor Forest re-planted
Example For a named volcanic eruption, describe Answer
Exam the immediate and long-term responses (Continue
Question: to the eruption. (8 marks) onto
back):
Describe the primary and secondary Name,
effects of a volcano that you have where,
studied.…read more

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