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Great Sitkin volcano
Stratovolcano 1740+ m / 5,709 ft
United States, Aleutian Islands, 52.08°N / -176.13°W
Current status: restless (2 out of 5)
Great Sitkin webcams / live data | Reports
Great Sitkin volcano books
Great Sitkin volcano eruptions:
1974 
Typical eruption style:
unspecified
Last earthquakes nearby
Latest satellite images
 

Great Sitkin volcano news & activity updates:

Great Sitkin volcano (Alaska): small steam explosion yesterday, alert raised to yellow

Monday Jun 03, 2019 08:23 AM | BY: T

A small steam explosion occurred at the volcano yesterday morning (21:40 AKDT on 1 June local time), detected in local seismic data, the Alaska Volcano Observatory (AVO) reported.
"No corresponding signal was seen in regional infrasound data or cloudy satellite observations. Low-level seismic activity was elevated just before and after the event. In response to this activity, AVO is raising the Aviation Color Code YELLOW and Alert Level to ADVISORY." (AVO)
Previous news
Friday, Jan 19, 2018
The recent unrest at the volcano, likely caused by a small intrusion of magma, has ended and the alert level was lowered to Green, the Alaska Volcano Observatory (AVO) reported earlier. ... [more]
Worldview-3 satellite image of the summit area of Great Sitkin volcano, November 21, 2017. The area of steaming indicated by the red arrow is the likely source of the volcanic emissions noted and photographed by local observers on Adak, November 19, 2017. The melt depressions on the east side of the 1974 lava flow were evident in a September 14, 2017 satellite image but not present in an April 18, 2017 image indicating that they likely formed during the spring-summer 2017. (image: Chris Waythomas / AVO / USGS)
Tuesday, Nov 28, 2017
Recent observations of a robust steam plume and a period of gradually increasing seismicity over several months at Great Sitkin prompted AVO to raise the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory on 22 November. ... [more]
Friday, Nov 24, 2017
An increase in seismic activity and degassing prompted the Alaska Volcano Observatory (AVO) to raise the alert level of the volcano to yellow today: ... [more]
Saturday, Jul 22, 2017
An increase in seismic activity was detected at Great Sitkin starting with seismic tremor on July 21 16:17 AKDT (July 22 00:17 UTC). After about an hour, tremor transitioned to discrete earthquakes. ... [more]

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