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1980 eruption of Mount St. Helens

View on map:46.200280°N 122.186670°W

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Mount St. Helens
46.252829°N 122.136818°W

The entire north face of the volcano was blown away and a dome has built up in the caldera since the 1980 eruption.


Dead trees from the eruption
46.252813°N 122.136791°W

You can tell that the pyroclastic flow came up the hill for the right parallel with the dead trees on the ridge.


Entire small mountain laid bare
46.252648°N 122.136544°W

All the trees on this small mountain were destroyed because the face faces the blast.

Mount St. Helens erupted in 1980 generating a large landslide and eruption along with several lahars.

Description


1980 eruption of Mount St. Helens

In 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in Washington, in the United States. The eruption (which was a VEI 5 event) was the only significant one to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California. The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a huge bulge and a fracture system on the mountain's north slope.

References

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