Summary of the eruptive activity at Mount St. Helens through the end of 1989. Beginning in 1981, the eruption has been characterized mainly by intermittent dome-building activity, punctuated by occasional, smaller explosive bursts. The inset shows a typical explosion plume, some of which have risen to 20,000 feet (Photograph by Jim Zollweg).
URL: <https://pubs.usgs.gov/gip/msh/summary.html>
Contact: John Watson
Last updated: 06.25.97
Subsequent
Eruptive Activity