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Semisopochnoi volcan

Mise à jour: 27 nov.. 2022 09:34 GMT -
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)
Last update: 24 nov. 2022 (Aviation Color Code reduced to Yellow)

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Style éruptif tipique: unspecified
Eruptions du volcan Semisopochnoi: 2021, 2020, 2019, 2018, 1987

Derniers séismes proches

No recent earthquakes

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


See also: Sentinel hub | Landsat 8 | NASA FIRMS
Actualités
jeu., 24 nov. 2022, 04:44

Semisopochnoi volcano (Aleutian Islands): Aviation Color Code reduced to Yellow

Cloud-free satellite imagery of Semisopochnoi volcano on 13 Nov (image: Sentinel 2)
The Aviation Color Code for the volcano was lowered to "Yellow", as a decreasing trend of the activity at the volcano continues. ... Read all
mer., 23 nov. 2022, 15:00

Semisopochnoi volcano (Aleutian Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 16 November-22 November 2022 (Continuing Activity)

AVO reported ongoing low-level seismicity at Semisopochnoi characterized by intermittent seismic tremor and occasional low-frequency earthquakes during 16-22 November. Satellite and webcam views were mostly obscured by weather clouds, though during clear views continuous gas-and-steam emissions from the N crater of Mount Cerberus were visible. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. ... Read all
Actualités
jeu., 24 nov. 2022, 04:44

Semisopochnoi volcano (Aleutian Islands): Aviation Color Code reduced to Yellow

Cloud-free satellite imagery of Semisopochnoi volcano on 13 Nov (image: Sentinel 2)
The Aviation Color Code for the volcano was lowered to "Yellow", as a decreasing trend of the activity at the volcano continues. ... Read all
mer., 23 nov. 2022, 15:00

Semisopochnoi volcano (Aleutian Islands, USA) - Smithsonian / USGS Weekly Volcanic Activity Report for 16 November-22 November 2022 (Continuing Activity)

AVO reported ongoing low-level seismicity at Semisopochnoi characterized by intermittent seismic tremor and occasional low-frequency earthquakes during 16-22 November. Satellite and webcam views were mostly obscured by weather clouds, though during clear views continuous gas-and-steam emissions from the N crater of Mount Cerberus were visible. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. ... Read all
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