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Great Sitkin volcan

Mise à jour: 31 janv.. 2023 21:30 GMT -
Stratovolcano 1740+ m / 5,709 ft
United States, Aleutian Islands, 52.08°N / -176.13°W
Condition actuelle: Activité petite ou avertissement éruption imminente (3 sur 5)
Last update: 25 janv. 2023 (Smithsonian / USGS Weekly Volcanic Activity Report)

Montrer carte interactive
Style éruptif tipique: unspecified
Eruptions du volcan Great Sitkin: 2021, 1974

Derniers séismes proches

HeureMag. / ProfondeurDistance/Lieu
vendredi, 20 janvier 2023 GMT (1 séisme)
20 janv. 2023 11:08 (GMT -10) (20 janv.. 2023 21:08 GMT)
1.4

9.2 km
21 km (13 mi)
30 Km E of Adak, Alaska

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


See also: Sentinel hub | Landsat 8 | NASA FIRMS
Actualités
mer., 25 janv. 2023, 15:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 18 January-24 January 2023 (Continuing Activity)

AVO reported that slightly elevated surface temperatures at Great Sitkin were identified in satellite images on 18 January, suggesting continuing lava effusion at a low rate primarily to the S and E. A few small earthquakes were detected on most days by the local seismic network. No activity was observed in mostly cloudy satellite and web camera images during 19-24 January. ... Read all
mer., 18 janv. 2023, 15:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 11 January-17 January 2023 (Continuing Activity)

AVO reported that radar images acquired on 13 and 15 January confirmed ongoing slow lava effusion at Great Sitkin; effusion likely continued through 17 January. Slightly elevated surface temperatures were identified in satellite images during 10-11 January and a few small earthquakes were detected on most days during 10-17 January. Weather clouds sometimes obscured satellite and webcam views. ... Read all
Actualités
mer., 25 janv. 2023, 15:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 18 January-24 January 2023 (Continuing Activity)

AVO reported that slightly elevated surface temperatures at Great Sitkin were identified in satellite images on 18 January, suggesting continuing lava effusion at a low rate primarily to the S and E. A few small earthquakes were detected on most days by the local seismic network. No activity was observed in mostly cloudy satellite and web camera images during 19-24 January. ... Read all
mer., 18 janv. 2023, 15:00

Great Sitkin volcano (Andreanof Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 11 January-17 January 2023 (Continuing Activity)

AVO reported that radar images acquired on 13 and 15 January confirmed ongoing slow lava effusion at Great Sitkin; effusion likely continued through 17 January. Slightly elevated surface temperatures were identified in satellite images during 10-11 January and a few small earthquakes were detected on most days during 10-17 January. Weather clouds sometimes obscured satellite and webcam views. ... Read all
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