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Mount St. Helens - Case Study
Description
Geography Mind Map on Mount St. Helens - Case Study, created by vina_56 on 14/09/2013.
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geography
geography
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Created by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
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vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
Copied by
vina_56
about 11 years ago
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Resource summary
Mount St. Helens - Case Study
Monitoring & Predicting - save lives
satellites - ash clouds, emissions etc.
seismic activity - tilt meters & seismographs
thermal changes
volcanic gases - sulphur/chlorine ratio
Destructive plate boundary - Juan de Fuca & North American
plates move towards each other
oceanic crust - forced under continental playe
oceanic crust melts into magma
magma rises - convection currents force magma up through cracks
Secondary Effects
ash mixed with melted snow = landslides
fallen trees - blocked streams - knocked bridges
ash fall = roads closed
no fishing - killed fishes
Primary Effects
pyroclastic flow - blasted sideways from volcano
flattened trees
nearly 7000 big game animals perished
Spirit Lake = ash & rock
Toutle River = heated to 30°C
peak of volcano = blasted away - 390m shorter
Location - North-West of USA - in Washington - in Cascades Mountains (Rockies)
Immediate Responses
EVACUATION - Governor of Wash. - small eruptions of gas & steam = signs in early 1980
2 million gas masks - President - ash breathing
Helicopter mobilised - any survivors
Ash cleared from roads - travelling - visibility
FLIGHTS CANCELLED - ash in air
Long-Term Responses
10 million trees replanted
area = national monument - 1982 - $1.4 million - access road & visitor centres (attracts 3 million a year)
Roads & Bridges - along Toutle River = rebuilt - residents & tourists
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