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

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[edit] Description

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) USGS image from [1]

[edit] Summary

Description

Mount St. Helens Ash plume /column

Source

http://vulcan.wr.usgs.gov/Volcanoes/MSH/SlideSet/ljt_slideset_old.html

Date
Author

U.S. government

Permission

PD

Other versions none

[edit] Licensing

Public domain This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.

Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.


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