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Recent quakes near Iliamna
Thursday, Mar 07, 2013
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. [more]
Time and depth of rencent quakes under Iliamna volcano
Sunday, Feb 03, 2013
Earthquake activity remains slightly increased. [more]

Iliamna volcano

stratovolcano 3053 m / 10,016 ft
Cook Inlet (SW Alaska), 60.03°N / -153.09°W
Current status: dormant (1 out of 5)
Iliamna webcams / live data
Last update: 7 Mar 2013
Typical eruption style: explosive
Iliamna volcano eruptions: 1953(?), 1952(?), 1933(?), 1876, 1867, 1843(?), 1793(?), 1778-79, 1768(?)
radiocarbon-dated: 1650 ?, 450 BC ?, 2050 BC ?, 5050 BC ? The summit of Iliamna volcano with active fumaroles (photo: Tina Neal, Alaska Volcano Observatory / USGS)
TimeMag. / DepthDistanceLocation
Sat, 25 Oct
Sat, 25 Oct 14:34 UTCM 3.1 / 115.2 km25 km24km SSW of Redoubt Volcano, Alaska
Sat, 25 Oct 05:53 UTCM 2.1 / 99.7 km21 km37km S of Redoubt Volcano, Alaska
Sat, 25 Oct 05:23 UTCM 2.4 / 104.5 km19 km42km S of Redoubt Volcano, Alaska
Sat, 25 Oct 00:38 UTCM 2.1 / 101.3 km23 km41km S of Redoubt Volcano, Alaska
Wed, 22 Oct
Wed, 22 Oct 18:46 UTCM 2.4 / 98.9 km19 km41km S of Redoubt Volcano, Alaska
View all recent quakes
Iliamna volcano is a large stratovolcano on the western side of the Cook Inlet, in Lake Clark National Park 220 km SW of Anchorage or 100 km NW of Homer.
There are several uncertain reports about activity in the past 250 years, but the only confirmed known historical eruptions were small to moderate explosive eruptions in 1876, 1867, and between 778 and 1879. A larger eruption with pyroclastic flows was dated by radiocarbon method and occurred between 300 and 140 years ago, but was not observed. Most of the sparse eruption reports from Iliamna are probably referring to strong activity of fumaroles located east and SE of the summit.

Background:

Iliamna volcano has no distinct summit crater, but forms a flat top joined on the south by a 5 km long ridge with the prominent flank lava domes of North and South Twin Peaks. Another important flank vent is the Johnson Glacier dome on the NE flank.
Steep headwalls on the southern and eastern flanks expose an inaccessible cross-section of the volcano.
Several major glaciers radiate from its summit; the 4 largest together contain an estimated volume of 15 cubic km of ice.
Eruptions producing pyroclastic flows have been dated at as recent as about 300 and 140 years ago (into the historical period), and elevated seismicity accompanying dike emplacement beneath the volcano was recorded in 1996.

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

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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