Geologic Background:
Iliamna is located on the west side of Cook
Inlet. Iliamna is a deeply dissected stratovolcano 225 km
SW of Anchorage in the Aleutian Range. The volcano is
mostly covered with perennial snowfields and valley
glaciers. A prominent fumarole field near the summit
produces steam plumes that are commonly visible from
Anchorage and the Kenai Peninsula on clear days.
Historic Activity:
- At least 11 eruptions have been reported since 1768
but historic activity other than steam emissions has not
been documented. Large steam plume in 1987, but no
ash.
Recent Activity:
- Two large fumarolic areas occur on the south and east
sides of the ice-capped summit. These sulfur-rich
fumaroles are inaccessible; under favorable
meteorological conditions, the plumes from these
fumaroles extend 700 m or more above the
summit.
Data Sources:
- Global Volcanism Network (V. 21, No. 8 to V. 22, No.
9)
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