Image:St Helens May 18, 1980 showing ash column.jpg

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For more than nine hours a vigorous plume of ash erupted, eventually reaching 12 to 15 miles (20-25 kilometers) above sea level. The plume moved eastward at an average speed of 60 miles per hour (95 kilometers/hour), with ash reaching Idaho by noon. By early May 19, the devastating eruption was over. Shown here is a close-up view of the May 18 ash plume. (May 18, 1980, by Donald A. Swanson, USGS)

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This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy.

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  • (del) (cur) 02:12, 23 May 2004 . . Maveric149 ( Talk | contribs) . . 543×353 (37,588 bytes) ( USGS image from [http://vulcan.wr.usgs.gov/Volcanoes/MSH/SlideSet/ljt_slideset_old.html]<br><br>{{msg:PD}})

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