Global Hazards Geotour to the US Pacific Northwest, September 2006

St Helens crater

Page 2 of 35 Mount St Helens. View of the 1980 crater and the steaming lava dome from Johnston Ridge. The smooth area in the middle ground is covered with pyroclastic flow deposits from the 1980 to 1982 eruptions, subsequently incised by the North Fork of the Toutle River. Navigation Bar

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