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The Volcanic Eruption of Mount Saint Helens
511 Words2 Pages
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The Volcanic Eruption of Mount Saint Helens
On the 18th of May 1980 mount saint. Helens Erupted all thought Mount
Saint Helens is a volcano the eruption in 1980 was actually caused by
an earthquake the earthquake was 5.0 on the Richter scale. The tremor
trigged the biggest landslide ever recorded this was due to molten
rock movement.
Mount Saint Helens is part of the Cascade Range which has numerous
volcanoes thought Mount Saint Helens is the most active.
Text Box: Fig 1[IMAGE]There are many causes of the Mount Saint Helens
eruptions. To begin with the area North West USA is at the boundary of
two plates the Pacific and North American Plate, this is a
conservative plate margin with the plates moving past each, with these
two particular plates the movement is a little more complicated (see
fig .1) the Juan de Fuca plate has both constructive and destructive
plate margins adjacent to the north American plate. The Juan de Fuca
plate is thought of as sub ducting beneath the North American plate.
Thus the Juan De Fuca O...
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