アメリカ合衆国 · 成層火山
ボゴスロフ島
Bogoslof
- タイプ
- 成層火山
- 標高
- 150m
- 最終噴火
- 2017年
- タイプ
- 成層火山
- 国
- アメリカ合衆国
- 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
- 沈み込み帯 / 中間地殻 (15-25 km)
- 火山地形
- 複成火山
- 主要岩石
- 粗面安山岩 / 玄武岩質粗面安山岩
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
12件の記録用語集詳細タイムライン
- 2016年VEI 3観測記録2016-12-20 ~ 2017-08-30Central vent, just below sea level
- 1992年VEI 3観測記録1992-07-06 ~ 1992-07-24North tip of island (NE of 1927 dome)
- 1951年VEI 0根拠の記載なし1951-09-21 ~ 終了日不明
- 1931年VEI 1観測記録1931-10-31 ~ 終了日不明1926-1927 dome
- 1926年VEI 2観測記録1926-07-16 ~ 1928-07-02Between New and Old Bogoslof
- 1913年VEI ?根拠の記載なし1913-07-16 ~ 終了日不明Tahoma Peak
- 1909年VEI 2観測記録1909-09-16 ~ 1910-09-19Tahoma Peak
- 1908年VEI ?根拠の記載なし1908-01-15 ~ 終了日不明Metcalf Peak
- 1906年VEI 3観測記録1906-03-01 ~ 1907-09-01Metcalf Peak, McCullough Peak
- 1883年VEI 3観測記録1883-09-27 ~ 1895-07-02New Bogoslof (Grewingk)
- 1806年VEI 2観測記録1806-07-02 ~ 1823-07-02Old Bogoslof (Castle Rock)
- 1796年VEI 3観測記録1796-05 ~ 1804-07-02Old Bogoslof (Castle Rock)
近くの火山
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。