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Actualités
Thursday, Apr 02, 2020
The Alaska Volcano Observatory (AVO) lowered the alert level of the volcano because no signs of eruptive activity had been detected during the past two weeks: ... lire toutes
Thursday, Apr 02, 2020
Steam plume from Semisopochnoi volcano from satellite (image: Sentinel 2)
The Alaska Volcano Observatory (AVO) reported that seismic, infrasound, and satellite data over the past two weeks have shown no signs of eruptive activity. ... lire toutes
 

Semisopochnoi volcan

Stratovolcano 1221 m / 4,006 ft
United States, Aleutian Islands, 51.93°N / 179.58°E
Condition actuelle: en vigilance - niveau agité (2 sur 5)
Semisopochnoi webcams / données en temps réel | Reports
Semisopochnoi livres
Last update: 2 Apr 2020 (degassing, weak seismic activity)
Style éruptif tipique: unspecified
Eruptions du volcan Semisopochnoi: 1987 
HeureMag. / DepthDistanceLocation
Fri, 11 Sep 2020
Fri, 11 Sep 18:28 UTCM 0.4 / 7.5 km4 km264 Km W of Adak, Alaska (USA)
Fri, 11 Sep 18:12 UTCM 1.7 / 10 km7 km265 Km W of Adak, Alaska (USA)
Fri, 11 Sep 18:00 UTCM 0.8 / 6.2 km4 km264 Km W of Adak, Alaska (USA)
Fri, 11 Sep 17:54 UTCM 0.8 / 10 km5 km261 Km W of Adak, Alaska (USA)
Fri, 11 Sep 17:45 UTCM 0.3 / 6.7 km4 km264 Km W of Adak, Alaska (USA)
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Introduction:

Semisopochnoi, the largest subaerial volcano of the western Aleutians, is 20 km wide at sea level and contains an 8-km-wide caldera. It formed as a result of collapse of a low-angle, dominantly basaltic volcano following the eruption of a large volume of dacitic pumice. The high point of the island is 1221-m-high Anvil Peak, a double-peaked late-Pleistocene cone that forms much of the island's northern part. The three-peaked 774-m-high Mount Cerberus volcano was constructed during the Holocene within the caldera. Each of the peaks contains a summit crater; lava flows on the northern flank of Cerberus appear younger than those on the southern side. Other post-caldera volcanoes include the symmetrical 855-m-high Sugarloaf Peak SSE of the caldera and Lakeshore Cone, a small cinder cone at the edge of Fenner Lake in the NE part of the caldera. Most documented historical eruptions have originated from Cerberus, although Coats (1950) considered that both Sugarloaf and Lakeshore Cone within the caldera could have been active during historical time.
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Smithsonian / GVP volcano information


Derniers images satellite


See also: Sentinel hub | Landsat 8
 

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