Get our newsletter!
Voyages aux volcans actifs !
Volcanoes & Earthquakes - new app for Android
Volcanoes & Earthquakes - app for iPhone & iPad

Départs garantis:
23 févr. - 1 mars 2020: Volcanoes of the Danakil desert - Danakil desert (Ethiopia)
14-27 mars 2020: Désert, sels et volcans - Désert de Danakil (Éthiopie)
4-8 mai 2020: Spécial Volcan Krakatau - Le Krakatau, détroit de la Sonde
9-17 mai 2020: Montagnes de Feu - du Stromboli à l'Etna - Eoliennes + Etna
1-8 juin 2020: Le Grand Lac de Lave du Nyiragongo - République Démocratique du Congo et Rwanda
11-29 août 2020: Kamchatka - Land of Colors - Kamchatka (Russia)
3-19 sept. 2020: Les volcans actifs de Java - Java (Indonésie)
20 sept. - 5 oct. 2020: Feu au Paradis des Mers du Sud - Vanuatu - Vanuatu (Mer du Sud)
: Places libres / : Départ garanti / : Quelques places disponibles / : Groupe fermé
Diaporama
Actualités
Semisopochnoi volcano covered by clouds from satellite (image: Sentinel 2)
Friday, Dec 27, 2019
The Alaska Volcano Observatory (AVO) reported that ash plumes reached 5,000 ft (1,500 m) altitude and drifted about 15 km SE on 14 and 17 December. ... [details]
Seismic signal from Semisopochnoi volcano as recorded on Adak Island (image: AVO)
Saturday, Dec 07, 2019
An eruption is probably occurring at the volcano. The Alaska Volcano Observatory (AVO) detected seismic signals of strong volcanic tremor, probably corresponding to the arrival of magma in the summit vent, but the nature of the eruption itself is unclear: ... [details]
 

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: 27 Dec 2019
Style éruptif tipique: unspecified
Eruptions du volcan Semisopochnoi: 1987  No recent earthquakes
HeureMag. / DepthDistanceLocation

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.
---
Smithsonian / GVP volcano information


Derniers images satellite


See also: Sentinel hub | Landsat 8
 

Plus sur VolcanoDiscovery:

Copyright: VolcanoDiscovery ou autres sources indiquées.
Utilisation des documents: Les textes, les images et les vidéos de ce site internet sont protégées par copyright. Toute reproduction et tout usage sans accord préalable ne sont pas autorisés. Si vous désirez acquérir pour certains documents (photos, vidéos, textes ou autres) le droit de reproduction, d'édition et, plus généralement, de toute utilisation destinée à un usage public, qu'elle soit commerciale ou pas, vous êtes priés de nous contacter.