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Video - Mount St Helens Eruption (WHERE? WHEN? (Mount St Helens (One of…
Video - Mount St Helens Eruption
WHERE? WHEN?
Mount St Helens
One of the major peaks in the Cascade Mountains
Washington, U.S.A.
North America
Spring 1980
May 18th, 1980
Spirit Lake
Northern slope of the volcano
Blast or blow down zone
Area of devastation
Pumice Plain
Directly below the crater
CONSEQUENCES ON THE LAKE
Scarecely recognizable
100 species of aquatic life (insects, amphibians, fish) killed
Black water, hot springs
EVENT? WHAT HAPPENED?
5.1 magnitude earthquake
10 seconds landslide
For 120 years, the vocano has been quiet
Millions of tons of magma released
Colossal explosion
Cloud of searing gas and rocks
Pyroclastic flow
Poisonous steam and ash rose miles into the air
Largest volcanic eruption in North America
CONSEQUENCES ON NATURE
BEFORE
Oustanding beauty
Rich in wildlife
AFTER
All life is extinguished
Thousands of birds for more than a hundred species disappeared
Billions of insects are gone
Deer and elk are wiped out
CONSEQUENCES ON THE VOLCANO
Shape of the mountain altered
AFTER : gaping crater 1 mile wide, 2000 feet deep
BEFORE : cone-shaped volcano = strato volcano