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12-30 août 2019: Kamchatka - Land of Colors - Kamchatka (Russia)
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Diaporama
Actualités
Saturday, Jul 06, 2019
Yesterday, the Alaska Volcano Observatory raised the alert level of the volcano due to an increase in seismicity above background levels. ... [details]
Thursday, Nov 01, 2018
AVO reports that there have been no explosions in the last day, and only two the day before. The volcano remains highly restless and explosions could resume. [details]
 

Semisopochnoi volcan

Stratovolcano 1221 m / 4,006 ft
United States, Aleutian Islands, 51.93°N / 179.58°E
Condition actuelle: Activité petite ou avertissement éruption imminente (3 sur 5)
Semisopochnoi webcams / données en temps réel | Reports
Semisopochnoi livres
Last update: 6 Jul 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.
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Smithsonian / GVP volcano information


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