What volume of material was blown out by the Mt St. Helens eruption?
Joy Haughton
Dear Joy,
About 0.25 cubic kilometers of new volcanic rock was erupted on
May 18, 1980. This would make a cube about 600 meters (~2000 ft) on a side!
But much more material was moved by the eruption: the entire northern
side of the volcano collapsed and flowed down hill. The volume of this
collapse was about 2.5 cubic kilometers - ten times bigger than the new
lava.
Chuck Wood
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