1800’s Explosive Eruption

Mt. St. Helen’s is named by Captain Vancouver
January 1, 1792
March 1980 Magnitude 4.1 earthquake
March 27, 1980

1800’s Explosive Eruption

Mount St. Helens erupts explosively in 1800; intermittently from 1831 to 1857; then enters a 123-year quiet phase.

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