Photograph by R. McGimsey on April 23, 1999

Ash plume rises from Shishaldin Volcano during strombolian eruptive activity at the summit crater. Shishaldin is one of the most active volcanoes in the Aleutian arc, erupting at least 28 times since 1775 (including the April 1999 activity); the previous eruption occurred in late 1995 and early 1996 and consisted of minor explosions that produced low-level steam and ash emissions. The volcano is situated on that part of the Aleutian volcanic arc where the maximum rate of subduction occurs (about 7.5 cm/year).

URL of this document: http://volcanoes.usgs.gov/Imgs/Jpg/Shishaldin/Mcgimsey_04231999_caption.html
Last modified: May 17, 1999