Mt. St. Helen’s is named by Captain Vancouver
January 1, 1792
March 1980 Magnitude 4.1 earthquake
March 27, 1980
Mount St. Helens erupts explosively in 1800; intermittently from 1831 to 1857; then enters a 123-year quiet phase.
Mt. St. Helen’s is named by Captain Vancouver
January 1, 1792March 1980 Magnitude 4.1 earthquake
March 27, 1980
