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161537
Volcanic Case Study Mount St Helens
Description
Year 11 Summer Revision
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gcse
geography
restless earth
geography
restless earth
ib
Mind Map by
Eleanor Matthewman
, updated more than 1 year ago
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Created by
Eleanor Matthewman
over 11 years ago
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Resource summary
Volcanic Case Study Mount St Helens
Causes of the Eruption
An eruption is caused by plates moving
Volcanoes are formed at either constructive or destructive plate boundaries
Convection currents in the magma cause the plates to move
Primary and secondary effects
Primary- death
Secondary death
Primary- destroys wildlife
Primary- Fires
Primary- Evacuation
Primary- Building ruined
Secondary- Part of the area becomes 'out of bounds'
Secondary- lack of food and water
Positive and Negative impacts
Positive- increased fertility in soil
Negative- destroys wildlife
Positive- becomes a better-known area. Increases tourism (long term)
Negative- destroys houses and buildings
Negative- kills people both directly (hit by rocks) and indirectly (contaminates water)
Negative- costs a lot of money to recover
Positive- other countries come together to help that country
Immediate and Long-Term responses
immediate response- sending out helicopters to search for those who need help
Immediate response-emergency treatmemt
Immediate response- finding shelter for survivors who houses had become inhabitable
Immediate response- clearing the ash
Long term response- re-building houses and buildings
Long term responses- re-planting forests
Long term response- re-build roads to bring back tourism
Monitoring and Predicting erruptions
Earthquakes are a frequent sign of an impending eruption
Their frequency and strength can be recorded
Tiltmeters can identify small subtle changes in the landscape
GPS is used to identify changes as little as 1mm
Digital cameras on the crater's edge can photograph any changes
Gases are emitted before an eruption which contains a large amount of sulphur dioxide
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