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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
País
Japan
Región
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Altitud
136 m
Coordenadas
31.440, 140.051
Última erupción
1916
Contexto tectónico
Subduction zone / Oceanic crust (< 15 km)
Forma volcánica
Caldera
Roca principal
Dacite
Resumen geológico

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.

Resumen de Wikipedia

La isla Smith, Sumisutō o Sumisujima forma parte de las islas Izu y administrativamente es parte de Tokio, Japón. Se encuentra en la zona meridional de las islas Izu, a 110 km al sur de Aogashima, entre las Rocas Bayonnaise y la isla de Torishima; y a 520 km al sur de la zona continental de Tokio. Tiene un área de 0,03 km² y no posee población permanente, su altura máxima es de 136 m.

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Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
1672~1707 · 1 erupciones · VEI máx. 01848~1883 · 2 erupciones · VEI máx. 21883~1918 · 1 erupciones · VEI máx. 01954~1989 · 4 erupciones · VEI máx. 01989~2024 · 17 erupciones · VEI máx. 016721742184819181989

Línea de tiempo detallada

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

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.