Teachers Guide to Stratovolcanoes of the World
Facts and Figures

Mount St. Helens, Washington USA:
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Location: State of Washington, USA
Latitude and Longitude: 46.2º N, 122.2º W,
Elevation: 2,549 m (8,363 ft)
Volcano Type: Stratovolcano
Earliest Eruption: 10,000 BP
Oldest Historic Eruption: 1831
Most Recent Eruption: 1990
Number of Eruptions in 20th Century: 5
Largest Eruption: -1855 BP VEI = 6; 1800 VEI = 5; 1980 VEI = 5, 57 deaths
Notable Feature(s): "Bulge" on north face, lateral blast removed the upper 396 m (1,306.8 ft) of the volcano.
Notable Statistic: The blast devastated 596 square kilometers (229 square miles) and destroyed timber valued at several million dollars.