Image:Phreatic St. Helens.jpg

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Description Mount St. Helens, Washington, USA.

Phreatic eruption at the summit of Mount St. Helens. Hundreds of these steam-driven explosive eruptions occurred as magma steadily rose into the cone and boiled groundwater. These phreatic eruptions preceded the volcano's plinian eruption in May 1980.
Source

United States Geological Survey - http://volcanoes.usgs.gov/Products/Pglossary/HydroVolcEruption.html
Date

1980
Author

USGS
Permission
(Reusing this image)
Public domain This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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current04:38, 22 January 2008500×800 (88 KB)Axcordion (Talk | contribs) ({{Information |Description=Phreatic eruption at the summit of Mount St. Helens. Hundreds of these steam-driven explosive eruptions occurred as magma steadily rose into the cone and boiled groundwater. These phreatic eruptions preceded the volcano's plini)

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