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Bogoslof Island

Bogoslof

Stratovolkan · United States · 150 m

Bogoslof is the summit of a largely submarine volcano located in the Bering Sea, 50 km behind the main Aleutian arc. The island is about 1.5 x 0.6 km wide and due to its frequent eruptive activity and energetic wave action, has changed shape dramatically since it was first mapped in the late 1700s. The rounded lava dome and offshore spire at the northern tip of the island (bottom-center) formed in 1992. The circular, flat area at the right is a remnant of the 1927 lava dome, and the steep pinnacle is Castle Rock, a 1796 dome remnant.
Bogoslof is the summit of a largely submarine volcano located in the Bering Sea, 50 km behind the main Aleutian arc. The island is about 1.5 x 0.6 km wide and due to its frequent eruptive activity and energetic wave action, has changed shape dramatically since it was first mapped in the late 1700s. The rounded lava dome and offshore spire at the northern tip of the island (bottom-center) formed in 1992. The circular, flat area at the right is a remnant of the 1927 lava dome, and the steep pinnacle is Castle Rock, a 1796 dome remnant. · Foto: Photo by Terry Keith, 1994 (Alaska Volcano Observatory, U.S. Geological Survey). · Wikimedia Commons
Tipe
Stratovolkan
Negara
United States
Wilayah
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Ketinggian
150 m
Koordinat
53.930, -168.030
Letusan terakhir
2017
Kondisi tektonik
Subduction zone / Intermediate crust (15-25 km)
Bentuk lahan
Composite
Batuan utama
Trachyandesite / Basaltic Trachyandesite
Ringkasan geologi

Bogoslof is the emergent summit of a submarine volcano that lies 40 km N of the main Aleutian arc. It rises 1,500 m above the Bering Sea floor. Repeated construction and destruction of lava domes at different locations during historical time has greatly modified the appearance of this "Jack-in-the-Box" volcano and has introduced a confusing nomenclature applied during frequent visits by exploring expeditions. The present triangular-shaped, 0.75 x 2 km island consists of remnants of lava domes emplaced from 1796 to 1992. Castle Rock (Old Bogoslof) is a steep-sided pinnacle that is a remnant of a spine from the 1796 eruption. The small Fire Island (New Bogoslof), about 600 m NW of Bogoslof Island, is a remnant of a lava dome formed in 1883.

Ringkasan Wikipedia

Ringkasan Inggris

Bogoslof Island or Agasagook Island is the summit of a submarine stratovolcano at the south edge of the Bering Sea, 35 miles (56 km) northwest of Unalaska Island of the Aleutian Islands chain. It has a land area of 319.3 acres (1.292 km2) and is uninhabited. It is 1,040 meters (3,410 ft) long and 1,512 m (4,961 ft) wide, with a peak elevation of 490 feet (150 m). The stratovolcano rises about 6,000 ft (1,800 m) from the seabed, but the summit is the only part that projects above sea level. The island is believed to be relatively new, with the volcano being entirely below sea level before 1796, and most of the presently 300-acre island being formed by eruptions since 1900.

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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
1796~1818 · 2 letusan · VEI maks. 31862~1884 · 1 letusan · VEI maks. 31906~1928 · 5 letusan · VEI maks. 31928~1950 · 1 letusan · VEI maks. 11950~1972 · 1 letusan · VEI maks. 01972~1994 · 1 letusan · VEI maks. 31994~2016 · 1 letusan · VEI maks. 317961840190619501994

Garis waktu rinci

  1. 2016VEI 3Teramati
    2016-12-20 – 2017-08-30
    Central vent, just below sea level
  2. 1992VEI 3Teramati
    1992-07-06 – 1992-07-24
    North tip of island (NE of 1927 dome)
  3. 1951VEI 0Perkiraan geologi
    1951-09-21 – Berlangsung
  4. 1931VEI 1Teramati
    1931-10-31 – Berlangsung
    1926-1927 dome
  5. 1926VEI 2Teramati
    1926-07 – 1928
    Between New and Old Bogoslof
  6. 1913VEI ?Perkiraan geologi
    1913-07 – Berlangsung
    Tahoma Peak
  7. 1909VEI 2Teramati
    1909-09 – 1910-09-19
    Tahoma Peak
  8. 1908VEI ?Perkiraan geologi
    1908-01-15 – Berlangsung
    Metcalf Peak
  9. 1906VEI 3Teramati
    1906-03-01 – 1907-09-01
    Metcalf Peak, McCullough Peak
  10. 1883VEI 3Teramati
    1883-09-27 – 1895
    New Bogoslof (Grewingk)
  11. 1806VEI 2Teramati
    1806 – 1823
    Old Bogoslof (Castle Rock)
  12. 1796VEI 3Teramati
    1796-05 – 1804
    Old Bogoslof (Castle Rock)

Tautan eksternal

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