Mt St. Helens earthquake.

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Mt St. Helens earthquake

Mt St. Helens was a spot of beauty and nature it was just above Sprit Lake in Washington and was a very common spot for holidays.  No one remembered that is was an active volcano and would soon once again erupt like it had done hundreds of times before.

This stated happening on March 20th 1980.  There was a small earthquake as the magma started to work its way up to the surface.  The magma had been formed with pressure 8miles down.  Its way was blocked with old hardened magma, this meant that the new magma could not get out and was directed to the north flank of mountain.  On the 28th march the volcano started to thrown out ash people stared to release that the volcano was going to erupt. The magma kept been directed to the north of the mountain and began to form a bulge under the ground.  On the 31st march the state declared that nobody was to go in a 20mile zone because they thought it was going to erupt soon. Harry Truman refused to move she said ‘this lake is my life’ and ‘this is all way over exaggerated’.  Hundreds of tourists came to see it.

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Everybody stared to lose interest when it did not erupt, so David Johnston was left all alone to keep and eye on it.  The bulge (krytodome) was growing faster by 6feet a day its finally go 2 a size of 1km square there were thousands of small earthquakes going on each time that magma tried to get up.  At 8:32am 19th may on a sunny bright Sunday morning the last earthquake took place-reaching 5.1 on the richer scale then the ground ripped away that was holding back the lava.  The volcano erupted horizontally not veracity like most do to ...

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