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Diaporama
Great Sitkin volcan
Stratovolcano 1740+ m / 5,709 ft
United States, Aleutian Islands, 52.08°N / -176.13°W
Condition actuelle: normal / en sommeil (1 sur 5) | Reports
Great Sitkin livres
Eruptions du volcan Great Sitkin:
1974 
Style éruptif tipique:
unspecified
Derniers séismes proches
Derniers images satellite

Sentinel hub | Landsat 8
 

Great Sitkin volcano news & activity updates:

Great Sitkin volcano (Alaska): alert level lowered back to green

vendredi janv. 19, 2018 07:01 | AUTEUR : T

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.

"Earthquake activity at Great Sitkin Volcano has declined over the past two months to near background levels. No significant activity has been observed in satellite data during this time period and no steam plumes have been reported. AVO is thus lowering the Aviation Color Code
and Alert Level to GREEN/NORMAL.

The number of earthquakes located at Great Sitkin increased as early as late July 2016, and the elevated seismicity continued throughout most of 2017.
The unrest was likely the result of a magma intrusion beneath the volcano. The decline over the past two months in the number of earthquakes suggests the intrusion has stalled and the volcano is returning to a period of background seismicity.
Future intrusions at Great Sitkin should also lead to an increase in
earthquakes prior to any eruptive activity." (AVO)
Actualités précédentes
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)
mardi, 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. ... [details]
vendredi, 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: ... [details]
samedi, juil. 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. ... [details]
 

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