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Amerika Serikat · Stratovolkan

Bogoslof Island

Bogoslof

Tipe
Stratovolkan
Ketinggian
150 m
Letusan terakhir
2017
Bogoslof Island
Foto: T. Keith, U.S. Geological Survey · Public domain · Wikimedia Commons
Tipe
Stratovolkan
Negara
Amerika Serikat
Wilayah
Amerika Utara / Aleutian Ridge Volcanic Arc
Ketinggian
150 m
Koordinat
53.930, -168.030
Letusan terakhir
2017
Kondisi tektonik
Zona subduksi / Kerak menengah (15-25 km)
Bentuk lahan
Komposit
Batuan utama
Trakiandesit / Trakiandesit basaltik
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

12 tercatatGlosarium
Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu · Gunakan tombol panah untuk berpindah batang, Enter untuk membuka
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 0Metode tidak dinyatakan
    1951-09-21 – akhir tidak diketahui
  4. 1931VEI 1Teramati
    1931-10-31 – akhir tidak diketahui
    1926-1927 dome
  5. 1926VEI 2Teramati
    1926-07-16 – 1928-07-02
    Between New and Old Bogoslof
  6. 1913VEI ?Metode tidak dinyatakan
    1913-07-16 – akhir tidak diketahui
    Tahoma Peak
  7. 1909VEI 2Teramati
    1909-09-16 – 1910-09-19
    Tahoma Peak
  8. 1908VEI ?Metode tidak dinyatakan
    1908-01-15 – akhir tidak diketahui
    Metcalf Peak
  9. 1906VEI 3Teramati
    1906-03-01 – 1907-09-01
    Metcalf Peak, McCullough Peak
  10. 1883VEI 3Teramati
    1883-09-27 – 1895-07-02
    New Bogoslof (Grewingk)
  11. 1806VEI 2Teramati
    1806-07-02 – 1823-07-02
    Old Bogoslof (Castle Rock)
  12. 1796VEI 3Teramati
    1796-05 – 1804-07-02
    Old Bogoslof (Castle Rock)

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