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Giappone · Caldera

Iwo Jima

Ioto

Tipo
Caldera
Altitudine
172 m
Ultima eruzione
2025
Iwo Jima
Foto: ASTER volcano archive JPL/NASA · Public domain · Wikimedia Commons
Tipo
Caldera
Paese
Giappone
Regione
Pacifico nord-occidentale / Ogasawara Volcanic Arc
Altitudine
172 m
Coordinate
24.750, 141.289
Ultima eruzione
2025
Contesto tettonico
Zona di subduzione / Spessore crostale sconosciuto
Forma vulcanica
Caldera
Roccia principale
Trachiandesite / Trachiandesite basaltica
Sintesi geologica

Ioto, also known as Ogasawara-Iojima to distinguish it from several other "Sulfur Island" volcanoes, lies within a 9-km-wide submarine caldera.The triangular, low-elevation, 8-km-long island narrows toward its SW tip and has produced trachyandesitic and trachytic rocks that are more alkalic than those of other volcanoes in the Ogasawara Volcanic Arc. The island has undergone uplift for at least the past 700 years, accompanying resurgent doming of the caldera; a shoreline landed upon by Captain Cook's surveying crew in 1779 is now 40 m above sea level. The Motoyama plateau on the NE half of the island consists of submarine tuffs overlain by coral deposits and forms the island's high point. Many fumaroles are oriented along a NE-SW zone cutting through Motoyama. Numerous recorded phreatic eruptions, many from vents on the W and NW sides of the island, have accompanied the uplift.

Storia delle eruzioni

33 registrateGlossario
Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni · Usa le frecce per spostarti tra le barre, Invio per aprire
850 a.C.~658 a.C. · 1 eruzioni · VEI max. ?1833~2025 · 32 eruzioni · VEI max. 1850 a.C.83 a.C.49212581833

Cronologia dettagliata

  1. 2025VEI 1Osservata
    2025-09-01 – 2025-09-02
  2. 2023VEI 1Osservata
    2023-10-18 – 2024-03-16
  3. 2022VEI 1Osservata
    2022-07-11 – 2022-12-11
    Off SE coast
  4. 2021VEI 1Osservata
    2021-08-12 – 2021-11-24
    Off SE coast
  5. 2020VEI 1Osservata
    2020-12-28 – 2021-04-05
    Asodai Sinkhole
  6. 2018VEI 1Osservata
    2018-09-08 – 2018-09-14
    Off the S coast
  7. 2016VEI 1Osservata
    2016-08-31 – 2016-09-01
    Asodai Sinkhole
  8. 2015VEI 1Osservata
    2015-08-07 – 2015-08-07
    Kianohana Beach (N part of the island)
  9. 2013VEI 0Osservata
    2013-08-21 – 2013-08-30
    Off the NE coast
  10. 2012VEI 1Osservata
    2012-12-01 – 2013-04-11
    Asodai
  11. 2012VEI 1Osservata
    2012-02-10 – 2012-07-09
    Asodai
  12. 2010VEI 1Osservata
    2010-06-19 – 2010-06-19
  13. 2004VEI 1Metodo non indicato
    2004-06-06 – 2004-06-08
    Asodai area
  14. 2001VEI 1Osservata
    2001-09-21 – 2001-10-23
    Off SE coast and Idogahama (NW coast)
  15. 1999VEI 1Osservata
    1999-09-10 – 1999-09-10
    Asodai area
  16. 1994VEI 1Osservata
    1994-08-22 – 1994-08-22
    NE side
  17. 1993VEI 1Metodo non indicato
    1993-10-27 – 1993-11-16
    Asodai area and NE of Iwo-jima
  18. 1982VEI 1Osservata
    1982-03-09 – 1982-03-10
    NW side (Idogahama beach)
  19. 1982VEI 1Osservata
    1982-11-28 – 1982-12-16
    West side (Asodai)
  20. 1980VEI 1Osservata
    1980-03-13 – 1980-03-13
    Kitanohara
  21. 1978VEI 1Osservata
    1978-12-11 – 1978-12-11
    West side (Asodai)
  22. 1976VEI 1Osservata
    1976-01-16 – fine sconosciuta
    West side (Asodai)
  23. 1974VEI 0Metodo non indicato
    1974-01-16 – 1974-02-02
    NW of Iwo-jima (Kaiseinishinoba)
  24. 1969VEI 1Osservata
    1969-01-12 – 1969-01-21
    West side (Asodai)
  25. 1969VEI 1Osservata
    1969-12-01 – 1969-12-01
  26. 1967VEI 1Osservata
    1967-12-23 – 1967-12-23
    West side (Asodai)
  27. 1957VEI 1Osservata
    1957-03-28 – 1957-03-28
    Chidoriga-hara
  28. 1944VEI 1Osservata
    1944-12-16 – fine sconosciuta
    North and west sides near the coast
  29. 1935VEI 1Osservata
    1935-07-02 – fine sconosciuta
    SW side at Chidoriga-hara
  30. 1930VEI 1Osservata
    1930-07-02 – fine sconosciuta
    NW side near the coast
  31. 1922VEI 1Osservata
    1922-07-16 – fine sconosciuta
    West side (Asodai)
  32. 1889VEI 1Osservata
    1889-12-31 – fine sconosciuta
    Chidoriga-ana
  33. 850 a.C. (±50 anni)VEI ?Stima geologica
    850 a.C. – fine sconosciuta
    Motoyama

Vulcani nelle vicinanze

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