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Smith Island

Sumisujima

Caldera · Japan · 136 m

Wave erosion has exposed the spectacular stratigraphy of Sumisujima, a steep-sided pinnacle that is a remnant of the outer southern flank of a submarine caldera 6-9 km wide. Intrusive rocks, dikes, tephra layers, and breccias are visible in this view of the eastern side of the pinnacle. Submarine eruptions have been reported from a number of locations near here, the last of which occurred in 1916. Water discoloration has been frequently observed nearby since the 1970s.
Wave erosion has exposed the spectacular stratigraphy of Sumisujima, a steep-sided pinnacle that is a remnant of the outer southern flank of a submarine caldera 6-9 km wide. Intrusive rocks, dikes, tephra layers, and breccias are visible in this view of the eastern side of the pinnacle. Submarine eruptions have been reported from a number of locations near here, the last of which occurred in 1916. Water discoloration has been frequently observed nearby since the 1970s. · Foto: Copyrighted photo by Kenichiro Tani, 2002 (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
Caldera
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Altitudine
136 m
Coordinate
31.440, 140.051
Ultima eruzione
1916
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Caldera
Roccia principale
Dacite
Sintesi geologica

Sumisujima (also known as Smith Rocks) is a steep-sided basaltic pinnacle that forms part of the outer southern flank of a 8-9 km submarine caldera that truncates a 20-km-wide seamount. The caldera was formed between about 60,000 and 30,000 years ago. The Shirane dacitic central cone, 3 km wide and 800 m high, rises to within 8 m of the ocean surface in the eastern side of the caldera, whose 600-700 m walls and outer flanks expose basaltic, andesitic, and rhyolitic rocks. Two large submarine cones, Sumisu Knolls No. 1 and 2, lie west of the caldera. Submarine eruptions have been reported from a number of locations near Sumisujima, the last of which occurred in 1916. Water discoloration has frequently been observed since the 1970's. In October 1992 a 6-km-long zone of discolored water was seen extending from the shallow Shirane rock mass near the eastern rim of the caldera, which rises to within 7 m of the ocean surface and is the youngest feature of the volcanic complex.

Sintesi da Wikipedia

Riassunto in inglese

Sumisu Island is a volcanic, deserted island located in the Philippine Sea approximately 110 kilometres (68 mi) off the coast of Aogashima, near the southern end of the Izu archipelago, Japan. Sumisu-tō is administratively part of Tokyo Metropolis.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1672~1707 · 1 eruzioni · VEI max. 01848~1883 · 2 eruzioni · VEI max. 21883~1918 · 1 eruzioni · VEI max. 01954~1989 · 4 eruzioni · VEI max. 01989~2024 · 17 eruzioni · VEI max. 016721742184819181989

Cronologia dettagliata

  1. 2024VEI ?Osservata
    2024-09-18 – 2024-10-05
  2. 2005VEI 0Stima geologica
    2005-03-08 – 2005-03-08
  3. 2003VEI 0Stima geologica
    2003-11-06 – 2003-11-06
  4. 2002VEI 0Stima geologica
    2002-09-04 – 2002-09-04
  5. 2001VEI 0Stima geologica
    2001-10-31 – 2002-02-28
  6. 2000VEI 0Stima geologica
    2000-10-30 – 2000-10-30
  7. 1998VEI 0Stima geologica
    1998-10-27 – 1999-01-13
  8. 1997VEI 0Stima geologica
    1997-11-21 – 1997-11-21
  9. 1996VEI 0Stima geologica
    1996-01-22 – 1996-01-22
  10. 1995VEI 0Stima geologica
    1995-07-05 – 1995-07-07
  11. 1994VEI 0Stima geologica
    1994-01-17 – 1994-01-17
  12. 1994VEI 0Stima geologica
    1994-07-27 – 1994-07-27
  13. 1993VEI 0Stima geologica
    1993-09-08 – 1993-09-10
  14. 1992VEI 0Stima geologica
    1992-08-05 – 1992-10-07
    Shirane (7.5 km NE of Smith Rocks)
  15. 1991VEI 0Stima geologica
    1991-11-05 – 1991-11-05
  16. 1989VEI 0Stima geologica
    1989-01-18 – 1989-01-18
  17. 1989VEI 0Stima geologica
    1989-07-18 – 1989-07-18
  18. 1977VEI 0Stima geologica
    1977-10-16 – 1977-10-16
  19. 1976VEI 0Stima geologica
    1976-08-16 – 1976-08-16
  20. 1975VEI 0Stima geologica
    1975-08-13 – 1975-09-26
  21. 1974VEI 0Stima geologica
    1974-07-06 – 1974-07-06
  22. 1916VEI 0Osservata
    1916-06-21 – In corso
    Just west of Smith Rock
  23. 1873VEI 0Stima geologica
    1873 – In corso
    31.28 N 139.92 E
  24. 1870VEI 2Osservata
    1870-05 – In corso
    18 km SW of Smith Rock
  25. 1672VEI 0Stima geologica
    1672 – In corso
    31.58 N 140.25 E

Link esterni

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