Phreatic_St._Helens.jpg


Description
English: 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.
Date Taken on 4 April 1980
Source Archived source link
Author D.A. Swanson, United States Geological Survey

Licensing

Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey , an agency of the United States Department of the Interior . For more information, see the official USGS copyright policy .

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Original upload log

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The original description page was here . All following user names refer to en.wikipedia.
  • 2008-01-22 04:38 Axcordion 500×800× (89865 bytes) {{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