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Thursday, Mar 07, 2013
Recent quakes near Iliamna
Seismicity has risen again at the volcano recently, earthquake-report mentioned. Events as large as M1.4 occurred along a (ring?) fracture located south of the volcano’s summit. ... read all
Sunday, Feb 03, 2013
Time and depth of rencent quakes under Iliamna volcano
Earthquake activity remains slightly increased. ... read all

Iliamna volcano eruptions

stratovolcano 3053 m / 10,016 ft
Cook Inlet (SW Alaska), 60.03°N / -153.09°W
Eruption list: 1953(?), 1952(?), 1933(?), 1876, 1867, 1843(?), 1793(?), 1778-79, 1768(?)
radiocarbon-dated: 1650 ?, 450 BC ?, 2050 BC ?, 5050 BC ?

1996-97 earthquake swarms
During 1996-97, dike intrusions under the volcano caused several shallow earthquake swarms, but no eruption.

1987 steam plume
On the morning of 19 March 1987 at 8am, several pilots observed an unusually large steam plume rising about 1000-1100 m above the summit of Iliamna. The plume originated from an area on the upper S flank vent, but did not contain visible ash.
The event is not counted as an eruption, but a period of exceptionally strong degassing from active fumaroles.

1978 steam eruption
A brief steam eruption occurred on 7 November 1978 between 10 and 13 h local time, producing puffs of steam, ejected every 1-5 minutes, that rose an estimated 3 km above the summit. No ash was visible in the steam puffs. No unusual seismic activity was recorded.
Locatioin map of Iliamna volcano (source: Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys)
Locatioin map of Iliamna volcano (source: Alaska Volcano Observatory / Alaska Division of Geological & Geophysical Surveys)

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