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30 mars - 6 avril 2019: Land of Theseus - Saronic Gulf (Greece)
2-17 mai 2019: Du Krakatau à Bali - Java (Indonésie)
4-11(12) mai 2019: Fascinant Volcan et la Légende de l'Atlantide - Île de Santorin, Grèce
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18-26 mai 2019: Montagnes de Feu - du Stromboli à l'Etna - Eoliennes + Etna
25 mai - 1 juin 2019: Etna Discovery - Etna volcano (Italy)
7-12 juin 2019: Expédition au Volcan Yasur - Vanuatu (Mer du Sud)
8-23 juil. 2019: Du Krakatau à Bali - Java (Indonésie)
3-18 sept. 2019: Du Krakatau à Bali - Java (Indonésie)
12-20 oct. 2019: Montagnes de Feu - du Stromboli à l'Etna - Eoliennes + Etna
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Diaporama
Actualités
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. ... [details]
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. ... [details]
 

Great Sitkin volcan

Stratovolcano 1740+ m / 5,709 ft
United States, Aleutian Islands, 52.08°N / -176.13°W
Condition actuelle: en vigilance - niveau agité (2 sur 5)
Great Sitkin webcams / données en temps réel | Reports
Great Sitkin livres
Last update: 19 Jan 2018
Style éruptif tipique: unspecified
Eruptions du volcan Great Sitkin: 1974 No recent earthquakes
HeureMag. / DepthDistanceLocation

Introduction:

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


Derniers images satellite

 

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