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Mount Chōkai

Chokaisan

Stratovulcano · Japan · 2236 m

Chokaisan is the largest of the NE Honshu volcanoes, seen here from the NE. The volcano is comprised of two main overlapping edifices, the younger eastern area contains the large collapse scarp that was the source of the Kisakata debris avalanche, seen here opening to the N. Smaller cones later filled much of the area near the rear scarp.
Chokaisan is the largest of the NE Honshu volcanoes, seen here from the NE. The volcano is comprised of two main overlapping edifices, the younger eastern area contains the large collapse scarp that was the source of the Kisakata debris avalanche, seen here opening to the N. Smaller cones later filled much of the area near the rear scarp. · Foto: Photo courtesy Ichio Moriya (Kanazawa University). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Altitudine
2236 m
Coordinate
39.099, 140.049
Ultima eruzione
1974
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Massive Chokaisan volcano is composed of two overlapping stratovolcanoes with a conical profile that inspired the local names of Akita-Fuji or Dewa-Fuji. The summit of the gently sloping western edifice (Nishi-Chokaisan) is cut by a large scarp open to the south that contains lava domes. The younger eastern volcano (Higashi-Chokaisan) began forming about 20,000 years ago, and also has a large scarp, breached to the north. During an eruption about 2,600 years ago it was the source of the voluminous Kisakata debris avalanche, which reached the Pacific coast. Two post-caldera lava domes have been constructed at the upper SE end of the caldera. Intermittent reports of eruptions date back to the 6th century CE.

Sintesi da Wikipedia

Riassunto in inglese

Mount Chōkai is an active volcano located on the border of Akita and Yamagata in the Tōhoku region of Japan, and is 2,236 m (7,336 ft) tall. Because of its (roughly) symmetrical shape and massive size, it is also variously known as Dewa Fuji (出羽富士), Akita Fuji (秋田富士) or Shōnai Fuji (庄内富士) depending on the location of the viewer. In addition to being one of the 100 Famous Landscapes of Japan, it is also included as one of the 100 famous mountains in Japan, and famous 100 Geographical Features of Japan. It is surrounded by Chōkai Quasi-National Park. It is also a National Historic Site of Japan, and is regarded as a sacred mountain by followers of the Shugendō branch of Shinto which has the shrine Chōkaisan Ōmonoimi Shrine there and is popular with hikers.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1050 BCE~861 BCE · 1 eruzioni · VEI max. 0672 BCE~483 BCE · 1 eruzioni · VEI max. ?483 BCE~294 BCE · 1 eruzioni · VEI max. ?462~651 · 3 eruzioni · VEI max. ?651~840 · 6 eruzioni · VEI max. ?840~1029 · 8 eruzioni · VEI max. 31407~1596 · 2 eruzioni · VEI max. ?1596~1785 · 5 eruzioni · VEI max. 21785~1974 · 4 eruzioni · VEI max. 21050 BCE294 BCE46210291785

Cronologia dettagliata

  1. 1974VEI 1Osservata
    1974-03-01 – 1974-04-30
    E side of Shinzan, W of Kojin-yama
  2. 1834VEI 2Osservata
    1834-07-09 – 1834-07
  3. 1821VEI 2Osservata
    1821-05-23 – In corso
    Near Shinzan and Shichiko-zan
  4. 1800VEI 2Osservata
    1800-12 – 1804-07
    Shinzan (foot of Kojin-yama)
  5. 1764VEI 2Stima geologica
    1764 – In corso
  6. 1740VEI 2Osservata
    1740-06 – 1747
    Small crater at foot of Kojin-yama
  7. 1738VEI 2Stima geologica
    1738-12-31 – In corso
  8. 1735VEI 2Stima geologica
    1735 – In corso
  9. 1659VEI ?Osservata
    1659-04 – 1663
  10. 1560VEI ?Stima geologica
    1560 – In corso
  11. 1477VEI ?Stima geologica
    1477 – In corso
  12. 999VEI ?Stima geologica
    999 – In corso
  13. 948VEI ?Stima geologica
    948-12-31 – In corso
  14. 939VEI ?Osservata
    939-05-15 – In corso
  15. 884VEI ?Stima geologica
    884-07-26 – 884-08
  16. 871VEI 2Osservata
    871-05-05 – In corso
  17. 861VEI 3Stima geologica
    861-05 – In corso
  18. 857VEI ?Stima geologica
    857-05 – In corso
  19. 856VEI ?Stima geologica
    856 – In corso
  20. 839VEI ?Stima geologica
    839-10-14 – In corso
  21. 830VEI ?Osservata
    830-01 – In corso
  22. 817 (±7 anni)VEI ?Osservata
    817 – In corso
  23. 804VEI ?Stima geologica
    804 – 806
  24. 717VEI ?Stima geologica
    717-07 – In corso
  25. 711 (±3 anni)VEI ?Osservata
    711 – In corso
  26. 610 (±18 anni)VEI ?Stima geologica
    610 – In corso
  27. 577VEI ?Stima geologica
    577-12-01 – 578-07-15
  28. 573VEI ?Stima geologica
    573-03 – In corso
  29. 450 a.C.VEI ?Stima geologica
    BCE 450 – In corso
  30. 650 a.C.VEI ?Stima geologica
    BCE 650 – In corso
    Higashi-Chokai
  31. 1050 a.C.VEI 0Stima geologica
    BCE 1050 – In corso
    West flank (Saruana crater)

Link esterni

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