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Oakan

Akan

Caldera · Japan · 1499 m

Oakandake, the largest post-caldera cone at Akan volcano, is seen here from the W across the Akan Caldera lake. It was constructed at the NE end of the 13 x 14 km caldera, opposite a cluster of stratovolcanoes at the SW end. Meakan in the SW group has been frequently active.
Oakandake, the largest post-caldera cone at Akan volcano, is seen here from the W across the Akan Caldera lake. It was constructed at the NE end of the 13 x 14 km caldera, opposite a cluster of stratovolcanoes at the SW end. Meakan in the SW group has been frequently active. · Foto: Photo by Wataru Hirose, 1996 (Hokkaido University). · Wikimedia Commons
Tipo
Caldera
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Kuril Volcanic Arc
Altitudine
1499 m
Coordinate
43.384, 144.013
Ultima eruzione
2026
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Caldera
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Akan is a 13 x 24 km caldera located immediately SW of Kussharo caldera in eastern Hokkaido. The elongated, irregular outline of the caldera rim reflects its incremental formation during major explosive eruptions from the early to mid-Pleistocene. There are four post-caldera stratovolcanoes, three at the SW end of the caldera and the other on the NE side. Conical Oakandake was frequently active during the Holocene. The 1-km-wide Nakamachineshiri crater of Meakandake was formed during a major pumice-and-scoria eruption about 13,500 years ago. The Meakandake group, composed of nine overlapping cones E of Lake Akan, has produced mild phreatic eruptions since the beginning of the 19th century. The main cone of Meakandake proper has a triple crater at its summit. Although recorded eruptions at Meakandake have consisted of minor phreatic explosions, four major magmatic eruptions with pyroclastic flows have also occurred during the Holocene.

Sintesi da Wikipedia

L'Oakan-dake è un vulcano a scudo situato nel parco nazionale di Akan sull'isola di Hokkaidō, in Giappone.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
7050 BCE~6747 BCE · 1 eruzioni · VEI max. 44630 BCE~4327 BCE · 1 eruzioni · VEI max. ?3722 BCE~3420 BCE · 1 eruzioni · VEI max. 33117 BCE~2815 BCE · 1 eruzioni · VEI max. ?2209 BCE~1907 BCE · 1 eruzioni · VEI max. ?999 BCE~697 BCE · 1 eruzioni · VEI max. ?697 BCE~394 BCE · 1 eruzioni · VEI max. ?394 BCE~92 BCE · 1 eruzioni · VEI max. ?92 BCE~211 · 2 eruzioni · VEI max. 4211~513 · 1 eruzioni · VEI max. ?513~816 · 1 eruzioni · VEI max. ?816~1118 · 1 eruzioni · VEI max. ?1118~1421 · 1 eruzioni · VEI max. ?1421~1723 · 2 eruzioni · VEI max. ?1723~2026 · 23 eruzioni · VEI max. 17050 BCE4932 BCE2512 BCE394 BCE1723

Cronologia dettagliata

  1. 2026VEI ?Osservata
    2026-03-07 – 2026-03-14
  2. 2025VEI ?Osservata
    2025-09-15 – 2025-09-15
  3. 2008VEI 1Osservata
    2008-11-18 – 2008-11-28
    Me-Akan (Ponmachineshiri)
  4. 2006VEI 1Osservata
    2006-03-21 – 2006-03-21
    NE flank of Me-Akan
  5. 1998VEI 1Osservata
    1998-11-09 – 1998-11-09
    Me-Akan (Ponmachineshiri)
  6. 1996VEI 1Osservata
    1996-11-21 – 1996-11-21
    Me-Akan (Ponmachineshiri crater no. 4)
  7. 1988VEI 1Osservata
    1988-01-05 – 1988-02-18
    Me-Akan (SE rim of Ponmachineshiri)
  8. 1984VEI 1Osservata
    1984-05-01 – 1984-05-01
    Me-Akan (Ponmachineshiri)
  9. 1966VEI 1Osservata
    1966-06-15 – 1966-06-15
    Me-Akan (Nakamachineshiri)
  10. 1965VEI 1Osservata
    1965-05-15 – 1965-05-15
    Me-Akan (Nakamachineshiri)
  11. 1964VEI 1Osservata
    1964-06-18 – 1964-07-04
    Me-Akan (Nakamachineshiri)
  12. 1962VEI 1Osservata
    1962-04-28 – 1962-04-28
    Me-Akan (Nakamachineshiri)
  13. 1960VEI 1Osservata
    1960-09-16 – 1960-09-16
    Me-Akan (Ponmachineshiri)
  14. 1959VEI 1Osservata
    1959-05-15 – 1959-10-16
    Me-Akan (Naka- and Ponmachineshiri)
  15. 1958VEI 1Osservata
    1958-02-23 – 1958-02-23
    Me-Akan (Ponmachineshiri)
  16. 1957VEI 1Osservata
    1957-02-26 – 1957-09-05
    Me-Akan (Ponmachineshiri)
  17. 1956VEI 1Osservata
    1956-03-18 – 1956-10-31
    Me-Akan (Ponmachineshiri)
  18. 1955VEI 1Osservata
    1955-11-19 – 1955-11-19
    Me-Akan (Ponmachineshiri)
  19. 1954VEI 1Osservata
    1954-01-07 – 1954-04-13
    Me-Akan (Nakamachineshiri)
  20. 1951VEI 1Stima geologica
    1951-07-31 – 1952-03-16
    Me-Akan (NE foot)
  21. 1927VEI 1Stima geologica
    1927-04 – 1927-05
    Me-Akan
  22. 1808VEI ?Osservata
    1808 – In corso
    Me-Akan
  23. 1780 (±75 anni)VEI 1Osservata
    1780 – In corso
    Me-Akan
  24. 1600 (±50 anni)VEI ?Stima geologica
    1600 – In corso
    Me-Akan
  25. 1550VEI ?Stima geologica
    1550 – In corso
    Me-Akan
  26. 1250 (±300 anni)VEI ?Stima geologica
    1250 – In corso
    Me-Akan (Ponmachineshiri)
  27. 950VEI ?Stima geologica
    950 – In corso
    Me-Akan (Ponmachineshiri)
  28. 600 (±300 anni)VEI ?Stima geologica
    600 – In corso
    Akan-Fuji
  29. 250VEI ?Stima geologica
    250 – In corso
    Akan-Fuji
  30. 100 (±100 anni)VEI ?Stima geologica
    100 – In corso
    Akan-Fuji
  31. 50 a.C.VEI 4Stima geologica
    BCE 50 – In corso
    Akan-Fuji
  32. 300 a.C. (±100 anni)VEI ?Stima geologica
    BCE 300 – In corso
    Akan-Fuji
  33. 550 a.C.VEI ?Stima geologica
    BCE 550 – In corso
    Akan-Fuji
  34. 800 a.C. (±250 anni)VEI ?Stima geologica
    BCE 800 – In corso
    Me-Akan (Ponmachineshiri)
  35. 2050 a.C.VEI ?Stima geologica
    BCE 2050 – In corso
    Kita-yama, Me-Akan (Ponmachineshiri)
  36. 3050 a.C.VEI ?Stima geologica
    BCE 3050 – In corso
    Nishi-yama, O-Akan
  37. 3550 a.C. (±500 anni)VEI 3Stima geologica
    BCE 3550 – In corso
    Me-Akan (Nakamachineshiri)
  38. 4550 a.C. (±500 anni)VEI ?Stima geologica
    BCE 4550 – In corso
    Me-Akan (Ponmachineshiri)
  39. 7050 a.C.VEI 4Stima geologica
    BCE 7050 – In corso
    Me-Akan (Nakamachineshiri)

Link esterni

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