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Mount Vsevidof

Vsevidof

Stratovolkan · United States · 2160 m

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. · Foto: Photo by Chris Nye (Alaska Division of Geological & Geophysical Surveys). · Wikimedia Commons
Tipe
Stratovolkan
Negara
United States
Wilayah
Amerika Utara / Aleutian Ridge Volcanic Arc
Ketinggian
2160 m
Koordinat
53.126, -168.688
Letusan terakhir
1878
Kondisi tektonik
Subduction zone / Intermediate crust (15-25 km)
Bentuk lahan
Composite
Batuan utama
Andesite / Basaltic Andesite
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
1784~1801 · 2 letusan · VEI maks. ?1801~1819 · 1 letusan · VEI maks. 31819~1836 · 1 letusan · VEI maks. ?1871~1888 · 2 letusan · VEI maks. 21940~1957 · 1 letusan · VEI maks. 217841819187119051940

Garis waktu rinci

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

Tautan eksternal

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