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Mount Akutan

Akutan

Stratovolkan · United States · 1303 m

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. · Foto: Photo by Jerry Chisum (Mark Airways), 1987 (courtesy of John Reeder, Alaska Div. Geology & Geophysical Surveys). · Wikimedia Commons
Tipe
Stratovolkan
Negara
United States
Wilayah
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Ketinggian
1303 m
Koordinat
54.134, -165.986
Letusan terakhir
1992
Kondisi tektonik
Subduction zone / Intermediate crust (15-25 km)
Bentuk lahan
Composite
Batuan utama
Basalt / Picro-Basalt
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
7620 BCE~7300 BCE · 1 letusan · VEI maks. ?4416 BCE~4096 BCE · 1 letusan · VEI maks. ?70~390 · 1 letusan · VEI maks. 5390~710 · 1 letusan · VEI maks. ?1351~1672 · 1 letusan · VEI maks. ?1672~1992 · 42 letusan · VEI maks. 27620 BCE5377 BCE2814 BCE571 BCE1672

Garis waktu rinci

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

Tautan eksternal

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