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須美寿島

Sumisujima

カルデラ · Japan · 136m

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. · 写真: 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
タイプ
カルデラ
国
Japan
地域
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
標高
136m
座標
31.440, 140.051
最終噴火
1916年
テクトニクス環境
Subduction zone / Oceanic crust (< 15 km)
火山地形
Caldera
主要岩石
Dacite
地質学的概要

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.

Wikipedia の要約

要約が短いです。詳細は記事全文をご覧ください。

須美寿島（すみすとう、すみすじま）は伊豆諸島の無人島。行政区画は東京都直轄。欧名はSmith Island。

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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
1672~1707 · 1件 · 最大 VEI 01848~1883 · 2件 · 最大 VEI 21883~1918 · 1件 · 最大 VEI 01954~1989 · 4件 · 最大 VEI 01989~2024 · 17件 · 最大 VEI 016721742184819181989

詳細タイムライン

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

外部リンク

⚠ 参考情報です。緊急対応には使用しないでください。