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Page history last edited by PBworks 16 years, 3 months ago



volcano wiki









blast.jpg (28153 bytes) 

Photo by US Geological Survey - Mount St. Helens from north looking over Mount Margaret

Mount Saint Helens is located in the state of Washington.

Elevation: 8,363ft


Estimation of Earliest Eruption: 10,000 BP (Before Present)

Earliest Recorded Eruption: 1831

Most Recent Eruption: 1990


Number of Eruptions in 20th and 21st Centuries: 5


Largest Eruption: 1855 BP VEI=6; 1800 VEI=5; 1980 VEI=5 with 56 deaths

(VEI stands for Volcanic Explosivity Index and is measured o






n a scale from 1-8 and takes into account the mountain height, amount of distruction, and the distance of thrown objects.)


Image:MSH82 st helens plume from harrys ridge 05-19-82.jpg






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