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Miyakejima

Stratovulcano · Japan · 775 m

The craters in the foreground and the lava flow to the right erupted in 1983 from vents on the SW flank of Miyakejima. The 8-km-wide island rises about 1.1 km from the sea floor in the northern Izu Islands, about 200 km SSW of Tokyo. The summit cone of Oyama (upper right) lies within a caldera that formed about 3,000 years ago. Frequent eruptions have occurred since 1085 CE at vents ranging from the summit to below sea level.
The craters in the foreground and the lava flow to the right erupted in 1983 from vents on the SW flank of Miyakejima. The 8-km-wide island rises about 1.1 km from the sea floor in the northern Izu Islands, about 200 km SSW of Tokyo. The summit cone of Oyama (upper right) lies within a caldera that formed about 3,000 years ago. Frequent eruptions have occurred since 1085 CE at vents ranging from the summit to below sea level. · Foto: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Altitudine
775 m
Coordinate
34.094, 139.526
Ultima eruzione
2010
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Composite
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

The circular, 8-km-wide island of Miyakejima forms a low-angle stratovolcano that rises about 1,100 m from the sea floor in the northern Izu Islands about 200 km SSW of Tokyo. The basaltic volcano is truncated by small summit calderas, one of which, 3.5 km wide, was formed during a major eruption about 2,500 years ago. Numerous craters and vents, including maars near the coast and radially oriented fissure vents, are present on the flanks. Frequent eruptions have been recorded since 1085 CE at vents ranging from the summit to below sea level, causing much damage on this small populated island. After a three-century-long hiatus ending in 1469 CE, activity has been dominated by flank fissure eruptions sometimes accompanied by minor summit eruptions. A 1.6-km-wide summit crater was slowly formed by subsidence during an eruption in 2000.

Sintesi da Wikipedia

Miyakejima è un'isola vulcanica abitata nell'isole Izu nel Mare delle Filippine a circa 180 chilometri a sud-est di Tokyo, in Giappone. Come con le altre isole del gruppo delle isole Izu, Miyakejima fa parte del Parco Nazionale Fuji-Hakone-Izu.

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
6450 BCE~6168 BCE · 1 eruzioni · VEI max. 43066 BCE~2784 BCE · 1 eruzioni · VEI max. 42220 BCE~1938 BCE · 1 eruzioni · VEI max. 31938 BCE~1656 BCE · 1 eruzioni · VEI max. 31656 BCE~1374 BCE · 1 eruzioni · VEI max. ?1374 BCE~1092 BCE · 1 eruzioni · VEI max. 31092 BCE~810 BCE · 1 eruzioni · VEI max. 4810 BCE~528 BCE · 1 eruzioni · VEI max. 3246 BCE~36 · 1 eruzioni · VEI max. 336~318 · 1 eruzioni · VEI max. 4318~600 · 2 eruzioni · VEI max. 3600~882 · 3 eruzioni · VEI max. 4882~1164 · 2 eruzioni · VEI max. 31446~1728 · 6 eruzioni · VEI max. 31728~2010 · 17 eruzioni · VEI max. 46450 BCE4476 BCE2220 BCE246 BCE1728

Cronologia dettagliata

  1. 2010VEI 1Osservata
    2010-04-10 – 2010-07-21
    Summit crater
  2. 2009VEI 1Osservata
    2009-04-01 – 2009-04-01
  3. 2008VEI 1Osservata
    2008-01-07 – 2008-01-07
  4. 2008VEI 1Osservata
    2008-05-08 – 2008-05-08
  5. 2006VEI 1Osservata
    2006-02-17 – 2006-02-17
  6. 2006VEI 1Osservata
    2006-08-23 – 2006-08-23
  7. 2005VEI 1Osservata
    2005-04-12 – 2005-05-18
  8. 2004VEI 1Osservata
    2004-11-30 – 2004-12-09
  9. 2001VEI 2Osservata
    2001-01-11 – 2002-11-24
  10. 2000VEI 3Osservata
    2000-06-27 – 2000-09-28
    Summit and submarine western flank
  11. 1983VEI 3Osservata
    1983-10-03 – 1983-10-04
    SW flank (4.5 km long NE-SW fissure)
  12. 1962VEI 2Osservata
    1962-08-24 – 1962-08-27
    NE flank
  13. 1940VEI 3Osservata
    1940-07-12 – 1940-08-05
    Oyama, NE flank
  14. 1874VEI 3Osservata
    1874-07-03 – 1874-07-17
    NNE flank (560 m)
  15. 1835VEI 2Osservata
    1835-11-11 – In corso
    West flank (east and SE of Ako)
  16. 1811VEI 2Osservata
    1811-01-27 – 1811-01-28
    Summit and NE flank?
  17. 1763VEI 4Osservata
    1763-08-17 – 1769
    Oyama, SSW flank (Shinmio maar)
  18. 1712VEI 3Osservata
    1712-02-04 – 1714
    SW flank (Kuwanoki-daira)
  19. 1709VEI ?Stima geologica
    1709-04-23 – In corso
  20. 1643VEI 3Osservata
    1643-03-31 – 1643-04
    SW flank (SE of Ako, Kuwanoki-daira?)
  21. 1595VEI 2Osservata
    1595-11-22 – In corso
    SE flank
  22. 1535VEI 2Osservata
    1535-03 – In corso
    SE flank
  23. 1469VEI 3Osservata
    1469-12-24 – In corso
    Oyama
  24. 1154VEI 3Osservata
    1154-11 – In corso
    NE flank?
  25. 1085VEI 2Osservata
    1085 – In corso
  26. 850VEI 4Osservata
    850 – In corso
    Oyama and East flank (Mi-ike maar)
  27. 832VEI 3Osservata
    832-06-23 – In corso
  28. 750 (±50 anni)VEI 3Stima geologica
    750 – In corso
    NE flank
  29. 500 (±50 anni)VEI 3Stima geologica
    500 – In corso
    Daihannya-yama
  30. 320 (±500 anni)VEI 3Stima geologica
    320 – In corso
    Sabigahama
  31. 260 (±500 anni)VEI 4Stima geologica
    260 – In corso
  32. 50 a.C. (±50 anni)VEI 3Stima geologica
    BCE 50 – In corso
    Taira-yama
  33. 600 a.C. (±500 anni)VEI 3Stima geologica
    BCE 600 – In corso
  34. 950 a.C. (±200 anni)VEI 4Stima geologica
    BCE 950 – In corso
    Hatchodaira caldera, S flank (Furumio maar)
  35. 1250 a.C.VEI 3Stima geologica
    BCE 1250 – In corso
  36. 1450 a.C. (±500 anni)VEI ?Stima geologica
    BCE 1450 – In corso
    NW flank (NGS scoria layer)
  37. 1800 a.C. (±50 anni)VEI 3Stima geologica
    BCE 1800 – In corso
    South flank (Mizutamari maar)
  38. 2000 a.C. (±100 anni)VEI 3Stima geologica
    BCE 2000 – In corso
  39. 2900 a.C. (±500 anni)VEI 4Stima geologica
    BCE 2900 – In corso
  40. 6450 a.C. (±500 anni)VEI 4Stima geologica
    BCE 6450 – In corso
    NW flank

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.