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News
Friday, Mar 20, 2020
AVO report that small local earthquakes continued over the past day beneath Great Sitkin volcano. No significant activity was observed in cloudy satellite and clear web camera images. [more]
Great Sitkin volcano from satellite (image: Sentinel 2)
Monday, Mar 09, 2020
The Alaska Volcano Observatory (AVO) recorded on 6 March at 06:31 local time relatively large earthquake with magnitude M 3.5. It was located approx. 1 km east-southeast of the summit at shallow depths (not more than 2 km below sea level). Since the quake, seismic activity has returned to lower levels, and no eruptive activity has been detected in infrasound or satellite data today. Although this earthquake represents a significant increase in the seismic activity at the volcano, it does not mean that an eruption is imminent. AVO is closely monitoring the volcano for other signs of unrest that may indicate increased activity or likelihood of an eruption. ... [more]
 

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
Last update: 20 Mar 2020
Typical eruption style: unspecified
Great Sitkin volcano eruptions: 1974 
TimeMag. / DepthDistanceLocation
Fri, 22 May 2020
Fri, 22 May 14:43 UTCM 0.1 / 4.7 km6 km37km NE of Adak, Alaska (USA)
Thu, 21 May 2020
Thu, 21 May 06:07 UTCM 0.3 / 0.3 km3 km42km ENE of Adak, Alaska (USA)
Wed, 20 May 2020
Wed, 20 May 22:41 UTCM 1.2 / 4.7 km9 km35km NE of Adak, Alaska (USA)
Fri, 15 May 2020
Fri, 15 May 19:06 UTCM 0.3 / 3.7 km2 km42km ENE of Adak, Alaska (USA)
Fri, 15 May 15:23 UTCM 0.6 / 0.1 km2 km42km ENE of Adak, Alaska (USA)
View all recent quakes

Background:

Constructed within the caldera of an older shield volcano forming the northern half of Great Sitkin Island, 1740-m-high Great Sitkin volcano contains a small, 0.8 x 1.2 km ice-filled summit caldera. Deep glacial valleys radiate from the summit, which lies at the eastern rim of the caldera, which was formed by massive edifice failure that produced a submarine debris avalanche that traveled more than 40 km to the north. The entire island is blanketed with a light-brown to black pumice layer up to 6 m thick. This deposit is overlain over much of the NW side of the island by ash deposits from a subsidiary vent NW of the caldera. Hot springs, mud pots, and fumaroles occur near the head of Big Fox Creek, south of the volcano. Historical eruptions have been recorded since the late-19th century. In 1945, a 400-600 m wide, flat-topped lava dome was emplaced through a glacier filling the steep-sided, 180-m-deep summit caldera.
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Smithsonian / GVP volcano information


Latest satellite images


See also: Sentinel hub | Landsat 8
 

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