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Mount Vsevidof

Vsevidof

Stratovolcano · United States · 2160m

Mount Vsevidof is allocated on SW Umnak Island. The historically active volcano, seen here from the south, contains an E-W zone of scoria cones on the W flank that fed many lava flows, including a large flow that reached the west coast of the island and formed Cape Kigushimkada.
Mount Vsevidof is allocated on SW Umnak Island. The historically active volcano, seen here from the south, contains an E-W zone of scoria cones on the W flank that fed many lava flows, including a large flow that reached the west coast of the island and formed Cape Kigushimkada. · Photo: Photo by Chris Nye (Alaska Division of Geological & Geophysical Surveys). · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America / Aleutian Ridge Volcanic Arc
Elevation
2160m
Coordinates
53.126, -168.688
Last eruption
1878
Tectonic setting
Subduction zone / Intermediate crust (15-25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The symmetrical Vsevidof stratovolcano, near the SW end of Umnak Island, contains a 1.2-km-wide, ice-filled summit crater that is breached by glaciers on the E and N sides. An E-W-trending zone of scoria cones that extends down much of the W flank has been the source of recorded eruptions. Most of the cone was constructed during the Holocene. Andesitic and dacitic lava flows originated from vents on the N and S flanks, and on the W-flank rift. The largest lava flow traveled down the W flank to the coast, forming Cape Kigushimkada.

From Wikipedia

Mount Vsevidof is a stratovolcano in the U.S. state of Alaska. Its summit is the highest point on Umnak Island, one of the eastern Aleutian Islands. Its symmetrical cone rises abruptly from its surroundings. The base of the volcano is around 10 km (6 mi) wide, steepening from about 15 degrees at 300 m (980 ft) altitude to around 30 degrees near the summit. Some glacial tongues have cut through narrow canyons up to 120 m (390 ft) deep, due to ice filling the crater and extending down the north and east flanks of the cone. It is most likely that Mount Vsevidof has not erupted in historic time. Reports of its latest eruption in 1957 is considered questionable by the Alaska Volcano Observatory. This also includes possible eruptions or activity which may have occurred at the volcano in 1784, 1790, 1830, 1878, and 1880.

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Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1784~1801 · 2 eruptions · max VEI ?1801~1819 · 1 eruptions · max VEI 31819~1836 · 1 eruptions · max VEI ?1871~1888 · 2 eruptions · max VEI 21940~1957 · 1 eruptions · max VEI 217841819187119051940

Detailed timeline

  1. 1957VEI 2Geological estimate
    1957-03-11 – 1957-03-12
    West flank fissure
  2. 1880VEI ?Geological estimate
    1880-07-02 – Ongoing
  3. 1878VEI 2Observed
    1878-07-02 – Ongoing
    West flank fissure ?
  4. 1830VEI ?Observed
    1830-07-02 – Ongoing
    SW end of Umnak Island
  5. 1817VEI 3Observed
    1817-07-02 – Ongoing
  6. 1790VEI ?Geological estimate
    1790-05-30 – Ongoing
  7. 1784VEI ?Geological estimate
    1784 – Ongoing

External links

⚠ For reference only. Not for emergency response.