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アクタン山

Akutan

成層火山 · United States · 1303m

Akutan has a 2-km-wide summit caldera with a large scoria cone that rises above the caldera rim. It is seen here from the south in eruption on 11 February 1987. A small lake occupies part of the caldera floor. The caldera rim is breached narrowly on the north side through which a 1978 lava flow traveled to within 2 km of the sea.
Akutan has a 2-km-wide summit caldera with a large scoria cone that rises above the caldera rim. It is seen here from the south in eruption on 11 February 1987. A small lake occupies part of the caldera floor. The caldera rim is breached narrowly on the north side through which a 1978 lava flow traveled to within 2 km of the sea. · 写真: Photo by Jerry Chisum (Mark Airways), 1987 (courtesy of John Reeder, Alaska Div. Geology & Geophysical Surveys). · Wikimedia Commons
タイプ
成層火山
国
United States
地域
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
標高
1303m
座標
54.134, -165.986
最終噴火
1992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
Basalt / Picro-Basalt
地質学的概要

Akutan contains a 2-km-wide caldera with a large cinder cone in the NE part of the caldera that has been the source of frequent explosive eruptions and occasional lava effusion that covers the caldera floor. An older, largely buried caldera was formed during the late Pleistocene or early Holocene. Two volcanic centers are located on the NW flank. Lava Peak is of Pleistocene age, and a cinder cone lower on the flank produced a lava flow in 1852 that extended the shoreline of the island and forms Lava Point. The 60-365 m deep younger caldera was formed during a major explosive eruption about 1,600 years ago and contains at least three lakes. A lava flow in 1978 traveled through a narrow breach in the north caldera rim almost to the coast. Fumaroles occur at the base of the caldera cinder cone, and hot springs are located NE of the caldera at the head of Hot Springs Bay valley and along the shores of Hot Springs Bay.

Wikipedia の要約

英語版の要約

Mount Akutan, officially Akutan Peak, is a stratovolcano in the Aleutian Islands of Alaska. Akutan Peak, at 4,275 feet (1,303 m), is the highest point on the caldera of the Akutan stratovolcano. Akutan contains a 2 km-wide caldera formed during a major explosive eruption about 1600 years ago. Recent eruptive activity has originated from a large cinder cone on the NE part of the caldera. It has been the source of frequent explosive eruptions with occasional lava effusion that blankets the caldera floor. A lava flow in 1978 traveled through a narrow breach in the north caldera rim to within 2 km of the coast. A small lake occupies part of the caldera floor. Two volcanic centers are located on the NW flank: Lava Peak is of Pleistocene age; and, a cinder cone lower on the flank which produced a lava flow in 1852 that extended the shoreline of the island and forms Lava Point. An older, mostly buried caldera seems to have formed in Pleistocene or Holocene time, while the current caldera formed in a VEI-5 eruption c. 340 AD. AVO has recorded 33 confirmed eruptions at Akutan, making it the volcano with the most eruptions in Alaska.

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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
7620 BCE~7300 BCE · 1件 · 最大 VEI ?4416 BCE~4096 BCE · 1件 · 最大 VEI ?70~390 · 1件 · 最大 VEI 5390~710 · 1件 · 最大 VEI ?1351~1672 · 1件 · 最大 VEI ?1672~1992 · 42件 · 最大 VEI 27620 BCE5377 BCE2814 BCE571 BCE1672

詳細タイムライン

  1. 1992年VEI 2観測記録
    1992-03-08 ~ 1992-05-21
  2. 1992年VEI 1観測記録
    1992-12-18 ~ 1992-12-18
  3. 1991年VEI 2観測記録
    1991-09-15 ~ 1991-10-29
  4. 1990年VEI 2観測記録
    1990-01-26 ~ 1990-01-26
  5. 1990年VEI 2観測記録
    1990-09-06 ~ 1990-10-01
  6. 1989年VEI 2観測記録
    1989-02-27 ~ 1989-03-28
  7. 1988年VEI 2観測記録
    1988-03-26 ~ 1988-07-20
  8. 1987年VEI 2観測記録
    1987-01-31 ~ 1987-06-24
  9. 1986年VEI 2観測記録
    1986-03-18 ~ 1986-06-30
  10. 1982年VEI 2観測記録
    1982-10-05 ~ 1983-05-16
  11. 1980年VEI 2観測記録
    1980-07-03 ~ 1980-07-08
  12. 1978年VEI 2観測記録
    1978-09-25 ~ 1978-10-16
  13. 1976年VEI 2観測記録
    1976-10-15 ~ 1977-05-09
  14. 1974年VEI 2観測記録
    1974-02-11 ~ 進行中
    West flank ?
  15. 1973年VEI 2観測記録
    1973-03-16 ~ 1973-05-16
  16. 1972年VEI 2地質学的推定
    1972-09-16 ~ 進行中
  17. 1962年VEI 2観測記録
    1962-11-05 ~ 進行中
  18. 1953年VEI 2観測記録
    1953-07-02 ~ 進行中
  19. 1951年VEI 2観測記録
    1951-10-16 ~ 進行中
  20. 1948年VEI 2観測記録
    1948-04-29 ~ 1948-08-07
  21. 1946年VEI 2観測記録
    1946-12 ~ 1947-01
  22. 1931年VEI 2観測記録
    1931-05 ~ 1931-08
  23. 1929年VEI 2観測記録
    1929-05 ~ 進行中
  24. 1927年VEI 2観測記録
    1927 ~ 1928
  25. 1912年VEI ?地質学的推定
    1912 ~ 進行中
  26. 1911年VEI 2観測記録
    1911 ~ 進行中
  27. 1908年VEI 0観測記録
    1908-02-22 ~ 進行中
  28. 1907年VEI ?観測記録
    1907 ~ 進行中
  29. 1896年VEI ?観測記録
    1896 ~ 進行中
  30. 1895年VEI 2観測記録
    1895-08-01 ~ 1895-08-14
  31. 1892年VEI 1観測記録
    1892-09-23 ~ 進行中
  32. 1887年VEI 0観測記録
    1887 ~ 進行中
  33. 1883年VEI 2観測記録
    1883 ~ 進行中
  34. 1867年VEI ?観測記録
    1867 ~ 進行中
  35. 1865年VEI ?観測記録
    1865 ~ 進行中
  36. 1862年VEI ?地質学的推定
    1862 ~ 進行中
  37. 1852年VEI ?観測記録
    1852 ~ 進行中
    NW flank (Lava Point)
  38. 1848年VEI 2観測記録
    1848-03-05 ~ 進行中
  39. 1845年VEI ?地質学的推定
    1845 ~ 進行中
  40. 1838年VEI ?地質学的推定
    1838 ~ 進行中
  41. 1828年VEI ?地質学的推定
    1828 ~ 進行中
  42. 1790年VEI ?地質学的推定
    1790 ~ 進行中
  43. 1420年 (±100年)VEI ?地質学的推定
    1420 ~ 進行中
  44. 550年VEI ?地質学的推定
    550 ~ 進行中
  45. 340年VEI 5地質学的推定
    340 ~ 進行中
  46. 紀元前 4150年VEI ?地質学的推定
    BCE 4150 ~ 進行中
  47. 紀元前 7620年 (±300年)VEI ?地質学的推定
    BCE 7620 ~ 進行中

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。