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Photo ID: h32jgiSubject: VolcanoesDescription
Active Volcanoes; Ash Clouds; Cascade Range; Ejecta; Eruptions; Explosive Eruptions; Stratovolcanoes; Volcanic Debris; Volcanism; VolcanologyFor more than 9 hours a vigorous plume of ash erupted from Mt. St. Helens, eventually reaching 12 to 15 miles above sea level. The plume moved eastward at an average speed of 60 miles per hour, with ash reaching Idaho by noon. By early May 19, 1980, the devastating eruption was over. Shown here is a close-up view of the May 19 ash plume.

Credit Line: Courtesy USGS Cascade Volcano Observatory
North America; United States; Washington; Mount Saint Helens
Photo Quality | Large 

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