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Thursday, Sep 27, 2007
AVO increased the Volcanic Alert Level to Advisory and the Aviation
Color Code to Yellow for Augustine on 22 September due to an increase
in seismic activity below the summit over the previous week. During
22-25 September, the earthquakes were generally less than M 1 and were
located at shallow depths beneath the summit. [more]
Thursday, Aug 17, 2006

AVO reduced the Concern Color Code at Augustine from Yellow to Green on 9 August. Seismic, satellite, and visual data indicated a decrease in activity to background levels. No changes were seen at the summit during the previous several months. AVO warned that the lava dome and surrounding area were still unstable despite the apparent cessation of lava-dome growth. Rockfalls and avalanches were still occurring, especially on the N flank, and may continue for several weeks or months.

[more]
Map of Augustine volcano, surrounding volcanoes, and surrounding communities. (Image courtesy Schaefer, Janet, Alaska Division of Geological & Geophysical Surveys.)
Map of Augustine volcano, surrounding volcanoes, and surrounding communities. (Image courtesy Schaefer, Janet, Alaska Division of Geological & Geophysical Surveys.)
Photograph of Augustine's summit and the steaming lava dome, taken on 4 January, 2006 (Photo: USGS)
Photograph of Augustine's summit and the steaming lava dome, taken on 4 January, 2006 (Photo: USGS)

Augustine volcano

Stratovolcano 1252 m
Cook Inlet (SW Alaska), 59.36°N / -153.43°W
Current status: dormant (1 out of 5)
Augustine webcams / live data
Last update: 9 Mar 2012
Typical eruption style: Explosive
Augustine volcano eruptions: 1812, 1883-84(?), 1908(?), 1935, 1963, 1971, 1976, 1986
TimeMag. / DepthDistanceLocation
Fri, 19 Sep
Fri, 19 Sep 08:39 UTCM 1.7 / 99.8 km21 km94km SE of Old Iliamna, Alaska
Mon, 8 Sep
Mon, 8 Sep 00:17 UTCM 2.3 / 121.7 km13 km96km SE of Old Iliamna, Alaska
Sun, 7 Sep
Sun, 7 Sep 11:19 UTCM 1.9 / 38.2 km19 km96km SE of Old Iliamna, Alaska
Sun, 7 Sep 05:34 UTCM 2.3 / 97.8 km27 km105km SE of Old Iliamna, Alaska
Sat, 6 Sep
Sat, 6 Sep 21:23 UTCM 2.3 / 116.9 km40 km77km SE of Old Iliamna, Alaska
View all recent quakes
Augustine is the most active volcano of the eastern Aleutian arc. It consists of several overlapping lava domes that frequently produce explosive eruptions and are notorious for collapsing, producing glowing avalanches (block and ash flows).
Augustine volcano had a devastating eruption 1883 when large parts of the summit dome complex collapsed. In the following century, several eruptions associated with dome growth have restored the volcano's height again. Historical eruptions after that date were typically explosive, producing pyroclastic pumice flows and block-and-ash flows, followed by regrowth of the lava domes.

Background:

The oldest exposed rocks on the flanks of Augustine are little more than 40,000 years old. At least 11 large debris avalanches have reached the sea during the past 1800-2000 years, and five major pumiceous tephras have been erupted during this interval.



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