GCSE Geography - Mt. St. Helens case study

Just a short summary case study for the eruption of Mount St Helens in 1980. Hope it helps :)

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Mount St. Helens
Mount St. Helens is a volcano in the Cascade Range of mountains in Washington State,
USA. They are Fold Mountains.
When did it erupt?
20th March 1980 there was an earthquake under the mountain, caused by magma
beginning to move
On 25th March there was 47 earthquakes
On 26th March, scientists issued a warning to the locals to tell them that they might
have to evacuate
On 27th March a whole load of gas and steam came out the top of the mountain
On 3rd April a bulge started to appear on the side of the mountain, which grew so
much that by 12th April it was 100 metres high
On 30th April scientists gave out a warning and the local authorities put a 30km
danger zone around the volcano to stop people from entering, however some
people did still enter
On 10th May there were more earthquakes underneath the mountain and the bulge
was continuing to grow
On 18th May the volcano erupted.
What happened?
Primary Impacts Secondary Impacts
Hot ash and gas destroyed forests Ash blocked up the rivers which
and logging camps destroyed popular fishing sites and
63 people got killed, mainly from caused flooding. This lead to crops
poisonous gas and livestock dying
Lahars (mudflows of ash and water) Flooding destroyed communications
covered an extensive area around such as railways and roads
the volcano Sediment was carried downstream
Loss of habitats. which ruined barge transport on the
Columbia River
Floods have increased.
Some short term responses and results of the eruption of Mount St Helens are:
Communications such as roads and bridges we rebuilt/repaired
People got rehoused.
Some long term responses and results of the eruption of Mount St Helens are:
Ash deposits improved soil fertility
The volcano is now more closely monitored
Tourism has increased, boosting local economy.


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