Eruptions of Mount St. Helens: Past, Present, and Future
by Robert I. Tilling,
Lyn Topinka, and
Donald A. Swanson
March 19, 2002: The page debris.html was revised because the velocity of the debris avalanche of 18 May 1980 was overestimated as the result of a typographical error. The incorrect speed of "155 to 180 miles an hour" has been changed to "110 to 155 miles an hour."
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URL: <https://pubs.usgs.gov/gip/msh/revision.html>
Contact: John Watson
Last updated: 03.19.02