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ボゴスロフ島

Bogoslof

成層火山 · United States · 150m

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. · 写真: Photo by Terry Keith, 1994 (Alaska Volcano Observatory, U.S. Geological Survey). · Wikimedia Commons
タイプ
成層火山
国
United States
地域
北アメリカ / Aleutian Ridge Volcanic Arc
標高
150m
座標
53.930, -168.030
最終噴火
2017年
テクトニクス環境
Subduction zone / Intermediate crust (15-25 km)
火山地形
Composite
主要岩石
Trachyandesite / Basaltic Trachyandesite
地質学的概要

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.

Wikipedia の要約

英語版の要約

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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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
1796~1818 · 2件 · 最大 VEI 31862~1884 · 1件 · 最大 VEI 31906~1928 · 5件 · 最大 VEI 31928~1950 · 1件 · 最大 VEI 11950~1972 · 1件 · 最大 VEI 01972~1994 · 1件 · 最大 VEI 31994~2016 · 1件 · 最大 VEI 317961840190619501994

詳細タイムライン

  1. 2016年VEI 3観測記録
    2016-12-20 ~ 2017-08-30
    Central vent, just below sea level
  2. 1992年VEI 3観測記録
    1992-07-06 ~ 1992-07-24
    North tip of island (NE of 1927 dome)
  3. 1951年VEI 0地質学的推定
    1951-09-21 ~ 進行中
  4. 1931年VEI 1観測記録
    1931-10-31 ~ 進行中
    1926-1927 dome
  5. 1926年VEI 2観測記録
    1926-07-16 ~ 1928-07-02
    Between New and Old Bogoslof
  6. 1913年VEI ?地質学的推定
    1913-07-16 ~ 進行中
    Tahoma Peak
  7. 1909年VEI 2観測記録
    1909-09-16 ~ 1910-09-19
    Tahoma Peak
  8. 1908年VEI ?地質学的推定
    1908-01-15 ~ 進行中
    Metcalf Peak
  9. 1906年VEI 3観測記録
    1906-03-01 ~ 1907-09-01
    Metcalf Peak, McCullough Peak
  10. 1883年VEI 3観測記録
    1883-09-27 ~ 1895-07-02
    New Bogoslof (Grewingk)
  11. 1806年VEI 2観測記録
    1806-07-02 ~ 1823-07-02
    Old Bogoslof (Castle Rock)
  12. 1796年VEI 3観測記録
    1796-05 ~ 1804-07-02
    Old Bogoslof (Castle Rock)

外部リンク

⚠ 参考情報です。緊急対応には使用しないでください。