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Mount Zaō

Zaozan [Zaosan]

Vulcano complesso · Japan · 1841 m

Okama crater of Goryudake within the Zaozan volcanic complex is shown here from the E. The 360-m-wide lake is about 60 m deep and is the site of many recorded eruptions. White mud deposited on the lake floor is periodically disturbed by gas emission, changing the color of the water.
Okama crater of Goryudake within the Zaozan volcanic complex is shown here from the E. The 360-m-wide lake is about 60 m deep and is the site of many recorded eruptions. White mud deposited on the lake floor is periodically disturbed by gas emission, changing the color of the water. · Foto: Copyrighted photo by Yoshihisa Kawanabe (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/). · Wikimedia Commons
Tipo
Vulcano complesso
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Altitudine
1841 m
Coordinate
38.144, 140.440
Ultima eruzione
1940
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

The Zaozan (or Zaosan) volcano group consists of a complex cluster of stratovolcanoes in north-central Honshu about 40 km W of Sendai Bay. The Pleistocene Ryuzan volcano forms the western group (Nishi-Zao), and Byobu and Fubo volcanoes form the southern group (Minami-Zao). The complex was constructed over granitic basement rocks thus has a relatively small volume. The 7 km3 Zaozan volcano proper forms the central group (Chuo-Zao), a complex topped by several lava domes and the Goshikidake tuff cone, aligned NW-SE. Several episodes of edifice collapse produced debris avalanches during the Pleistocene. Goshikidake contains the active Okama crater, filled with a colorful, strongly acidic crater lake; it has been the source of most of the frequent eruptions recorded since the 8th century CE.

Sintesi da Wikipedia

Riassunto in inglese

The Zaō Mountains , commonly called Mount Zaō, are a complex cluster of stratovolcanoes on the border between Yamagata Prefecture and Miyagi Prefecture in Japan. The central volcano includes several lava domes and a tuff cone, Goshiki-dake, which contains a crater lake named "Okama". Also known as the "Five Color Pond" because it changes color depending on the weather, it lies in a crater formed by a volcanic eruption in the 1720s. The lake is 360 metres (1,200 ft) in diameter and 60 m (200 ft) deep, and is one of the main tourist attractions in the area.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
7600 BCE~7282 BCE · 1 eruzioni · VEI max. ?5692 BCE~5374 BCE · 2 eruzioni · VEI max. ?4420 BCE~4102 BCE · 1 eruzioni · VEI max. ?4102 BCE~3784 BCE · 1 eruzioni · VEI max. ?3466 BCE~3148 BCE · 1 eruzioni · VEI max. ?2830 BCE~2512 BCE · 1 eruzioni · VEI max. ?2512 BCE~2194 BCE · 1 eruzioni · VEI max. ?2194 BCE~1876 BCE · 1 eruzioni · VEI max. ?1876 BCE~1558 BCE · 1 eruzioni · VEI max. ?32~350 · 1 eruzioni · VEI max. 4668~986 · 2 eruzioni · VEI max. 3986~1304 · 3 eruzioni · VEI max. 31304~1622 · 4 eruzioni · VEI max. 31622~1940 · 31 eruzioni · VEI max. 37600 BCE5374 BCE2830 BCE604 BCE1622

Cronologia dettagliata

  1. 1940VEI 1Osservata
    1940-05-18 – 1940-05-18
    Okama
  2. 1939VEI 1Stima geologica
    1939-07 – In corso
    Okama
  3. 1927VEI 1Stima geologica
    1927 – In corso
    Okama
  4. 1905VEI 1Osservata
    1905 – In corso
    Okama
  5. 1897VEI 1Stima geologica
    1897-01-14 – 1897-01-14
    Okama
  6. 1896VEI 1Osservata
    1896-03-08 – 1896-03-08
    Okama
  7. 1896VEI 1Stima geologica
    1896-09-01 – In corso
    Okama
  8. 1895VEI 1Osservata
    1895-02-15 – 1895-03-22
    Okama
  9. 1895VEI 2Osservata
    1895-08-22 – 1895-09-28
    Okama
  10. 1894VEI 2Osservata
    1894-07-03 – 1894-07-03
    Okama
  11. 1890VEI 1Stima geologica
    1890 – In corso
    Okama
  12. 1873VEI 1Osservata
    1873-08 – 1873-09
    Okama
  13. 1867VEI 2Osservata
    1867-10-21 – In corso
    Okama
  14. 1833VEI 2Osservata
    1833 – In corso
    Okama
  15. 1831VEI 2Osservata
    1831-11-22 – In corso
    Okama
  16. 1830VEI 2Osservata
    1830 – In corso
    Okama
  17. 1822VEI ?Osservata
    1822-05-01 – In corso
  18. 1821VEI 2Osservata
    1821-01-27 – 1821-05-01
    Okama
  19. 1809VEI 2Osservata
    1809-06-12 – 1809-12-29
    Okama
  20. 1806VEI 2Osservata
    1806-07-12 – In corso
    Okama
  21. 1804VEI 2Osservata
    1804-05 – In corso
    Okama
  22. 1796VEI 2Osservata
    1796-03-24 – In corso
    Okama
  23. 1794VEI 2Osservata
    1794-09-22 – 1794-12
    SE side of Okama
  24. 1694VEI 2Osservata
    1694-05-29 – 1694-08-30
    Okama
  25. 1670VEI 2Osservata
    1670-04-26 – 1670-09-26
    Okama
  26. 1669VEI 3Osservata
    1669 – In corso
    Okama
  27. 1668VEI 2Osservata
    1668-08 – In corso
    Okama
  28. 1641VEI 2Osservata
    1641 – In corso
    Okama
  29. 1630VEI 2Osservata
    1630 – In corso
    Okama
  30. 1623VEI 3Osservata
    1623-05-15 – 1624-11-15
    Okama
  31. 1622VEI 2Osservata
    1622 – In corso
    Okama
  32. 1620VEI 2Osservata
    1620 – In corso
    Okama
  33. 1400 (±100 anni)VEI 3Stima geologica
    1400 – In corso
    Goshiki-dake area
  34. 1350VEI 2Stima geologica
    1350 – In corso
    Okama
  35. 1331VEI 2Stima geologica
    1331 – 1333
    Okama
  36. 1230VEI 2Osservata
    1230-11-29 – In corso
    Okama
  37. 1227VEI 3Osservata
    1227-10 – In corso
    Okama
  38. 1183VEI 2Osservata
    1183-05-28 – In corso
    Okama
  39. 884VEI 3Osservata
    884 – In corso
    Okama
  40. 773VEI ?Stima geologica
    773-11 – In corso
    Okama
  41. 300 (±200 anni)VEI 4Stima geologica
    300 – In corso
    Goshiki-dake area
  42. 1600 a.C.VEI ?Stima geologica
    BCE 1600 – In corso
    Goshiki-dake
  43. 2000 a.C. (±500 anni)VEI ?Stima geologica
    BCE 2000 – In corso
    Goshiki-dake
  44. 2300 a.C. (±75 anni)VEI ?Stima geologica
    BCE 2300 – In corso
    Goshiki-dake area
  45. 2600 a.C. (±200 anni)VEI ?Stima geologica
    BCE 2600 – In corso
    Goshiki-dake area
  46. 3350 a.C. (±50 anni)VEI ?Stima geologica
    BCE 3350 – In corso
    Goshiki-dake area
  47. 3850 a.C. (±200 anni)VEI ?Stima geologica
    BCE 3850 – In corso
    Goshiki-dake area
  48. 4150 a.C. (±200 anni)VEI ?Stima geologica
    BCE 4150 – In corso
    Goshiki-dake area
  49. 5500 a.C.VEI ?Stima geologica
    BCE 5500 – In corso
    Goshiki-dake area
  50. 5600 a.C.VEI ?Stima geologica
    BCE 5600 – In corso
    Goshiki-dake
  51. 7600 a.C.VEI ?Stima geologica
    BCE 7600 – In corso
    Goshiki-dake area

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