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News
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. [more]
Triple-coned Mount Cerberus; the location of the 2018 eruption, in the foreground, with long-quiet Anvil Peak in the background. Credit: Roger Clifford, via AVO.
Tuesday, Oct 30, 2018
The renewed eruption has continued in the last few days. Regular small explosions are occurring, but there have been no sightings of ash plumes. [more]
 

Semisopochnoi volcano

Stratovolcano 1221 m / 4,006 ft
United States, Aleutian Islands, 51.93°N / 179.58°E
Current status: restless (2 out of 5)
Semisopochnoi webcams / live data | Reports
Semisopochnoi volcano books
Last update: 1 Nov 2018 (Explosive activity declines, continuing high seismicity)
Typical eruption style: unspecified
Semisopochnoi volcano eruptions: 2018, 1987No recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

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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