Geologic Background:
The symmetrical Amutka stratovolcano is located
at the northern side of an arcuate caldera-like feature
along the coast of the 8-km-wide island of the same name.
The 1066-m-high stratovolcano is topped by a 400-m wide
crater. A cinder cone is located near the NE coast.
Amutka has had several eruptions in historical time from
both summit and flank vents.
Historic Activity:
- Three historic eruptions: 1786, 1876, and 1963. The
1963 activity included explosions from both the central
crater and parasitic vents, producing ash and lava
flows.
Recent Activity:
- Activity in the 1980's consisted of summit eruptions
only.
- Small ash plumes in mid-September 1996
- Small ash puff on March 2, 1997
Data Sources:
- Smithsonian's SEAN Bulletin (V. 12, No. 8).
- Global Volcanism Network (V. 21, No. 9 and V. 22, No.
9)
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