May 18, 1980 eruption of Mount St. Helens, early evening, from Speelyai Hill. After 12 hours of vigorous eruptive activity, the vigor decreased, switching to spasmodic bursts of ash that lasted several days.

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Comments (1)

Westworth9 on March 11, 2012

12 hours...then several days? Jeez that's a long time

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  • Uploaded on June 24, 2008
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    by Jim Nieland

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