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Japan · Caldera

Smith Island

Sumisujima

Type
Caldera
Elevation
136m
Last eruption
1916
Smith Island
Photo: 国土交通省 · Attribution · Wikimedia Commons
Type
Caldera
Country
Japan
Region
Northwestern Pacific / Izu Volcanic Arc
Elevation
136m
Coordinates
31.440, 140.051
Last eruption
1916
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Caldera
Major rock type
Dacite
Geological summary

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.

From Wikipedia

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.

Wikipedia · CC BY-SA · Read full article →

Eruption history

25 recordedGlossary
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
1672~1707 · 1 eruptions · max VEI 01848~1883 · 2 eruptions · max VEI 21883~1918 · 1 eruptions · max VEI 01954~1989 · 4 eruptions · max VEI 01989~2024 · 17 eruptions · max VEI 016721742184819181989

Detailed timeline

  1. 2024VEI ?Observed
    2024-09-18 – 2024-10-05
  2. 2005VEI 0Method not stated
    2005-03-08 – 2005-03-08
  3. 2003VEI 0Method not stated
    2003-11-06 – 2003-11-06
  4. 2002VEI 0Method not stated
    2002-09-04 – 2002-09-04
  5. 2001VEI 0Method not stated
    2001-10-31 – 2002-02-28
  6. 2000VEI 0Method not stated
    2000-10-30 – 2000-10-30
  7. 1998VEI 0Method not stated
    1998-10-27 – 1999-01-13
  8. 1997VEI 0Method not stated
    1997-11-21 – 1997-11-21
  9. 1996VEI 0Method not stated
    1996-01-22 – 1996-01-22
  10. 1995VEI 0Method not stated
    1995-07-05 – 1995-07-07
  11. 1994VEI 0Method not stated
    1994-01-17 – 1994-01-17
  12. 1994VEI 0Method not stated
    1994-07-27 – 1994-07-27
  13. 1993VEI 0Method not stated
    1993-09-08 – 1993-09-10
  14. 1992VEI 0Method not stated
    1992-08-05 – 1992-10-07
    Shirane (7.5 km NE of Smith Rocks)
  15. 1991VEI 0Method not stated
    1991-11-05 – 1991-11-05
  16. 1989VEI 0Method not stated
    1989-01-18 – 1989-01-18
  17. 1989VEI 0Method not stated
    1989-07-18 – 1989-07-18
  18. 1977VEI 0Method not stated
    1977-10-16 – 1977-10-16
  19. 1976VEI 0Method not stated
    1976-08-16 – 1976-08-16
  20. 1975VEI 0Method not stated
    1975-08-13 – 1975-09-26
  21. 1974VEI 0Method not stated
    1974-07-06 – 1974-07-06
  22. 1916VEI 0Observed
    1916-06-21 – end unknown
    Just west of Smith Rock
  23. 1873VEI 0Method not stated
    1873-07-02 – end unknown
    31.28 N 139.92 E
  24. 1870VEI 2Observed
    1870-05-16 – end unknown
    18 km SW of Smith Rock
  25. 1672VEI 0Method not stated
    1672 – end unknown
    31.58 N 140.25 E

Nearby volcanoes

External links

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