Thursday, Oct 16, 2014
Strong ash emissions from the volcano were reported by a pilot shortly after midnight (UTC). The reported height of the plume was to up to 70,000 ft (21 km) altitude, which would indicate an unexpected, and sudden major explosion took place (if the observed plume was volcanic ash and not something else). Anchorage VAAC raised the Aviation Color Code to RED. ... [more]
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. ... [more]
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)
5 Mar 2016Typical eruption style
: ExplosiveAugustine volcano eruptions
: 2005-06, 1986, 1976, 1971, 1963, 1935, 1908(?), 1883-84(?), 1812
|Time||Mag. / Depth||Distance||Location|
|Fri, 18 May|
|Fri, 18 May 14:46 UTC||M 1.5 / 72.1 km||35 km||- 66km WSW of Anchor Point, Alaska|
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.
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.