Giappone · Caldera
Smith Island
Sumisujima
- Tipo
- Caldera
- Altitudine
- 136 m
- Ultima eruzione
- 1916
- Tipo
- Caldera
- Paese
- Giappone
- Regione
- Pacifico nord-occidentale / Izu Volcanic Arc
- Altitudine
- 136 m
- Coordinate
- 31.440, 140.051
- Ultima eruzione
- 1916
- Contesto tettonico
- Zona di subduzione / Crosta oceanica (< 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 ingleseSumisu 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
25 registrateGlossarioCronologia dettagliata
- 2024VEI ?Osservata2024-09-18 – 2024-10-05
- 2005VEI 0Metodo non indicato2005-03-08 – 2005-03-08
- 2003VEI 0Metodo non indicato2003-11-06 – 2003-11-06
- 2002VEI 0Metodo non indicato2002-09-04 – 2002-09-04
- 2001VEI 0Metodo non indicato2001-10-31 – 2002-02-28
- 2000VEI 0Metodo non indicato2000-10-30 – 2000-10-30
- 1998VEI 0Metodo non indicato1998-10-27 – 1999-01-13
- 1997VEI 0Metodo non indicato1997-11-21 – 1997-11-21
- 1996VEI 0Metodo non indicato1996-01-22 – 1996-01-22
- 1995VEI 0Metodo non indicato1995-07-05 – 1995-07-07
- 1994VEI 0Metodo non indicato1994-01-17 – 1994-01-17
- 1994VEI 0Metodo non indicato1994-07-27 – 1994-07-27
- 1993VEI 0Metodo non indicato1993-09-08 – 1993-09-10
- 1992VEI 0Metodo non indicato1992-08-05 – 1992-10-07Shirane (7.5 km NE of Smith Rocks)
- 1991VEI 0Metodo non indicato1991-11-05 – 1991-11-05
- 1989VEI 0Metodo non indicato1989-01-18 – 1989-01-18
- 1989VEI 0Metodo non indicato1989-07-18 – 1989-07-18
- 1977VEI 0Metodo non indicato1977-10-16 – 1977-10-16
- 1976VEI 0Metodo non indicato1976-08-16 – 1976-08-16
- 1975VEI 0Metodo non indicato1975-08-13 – 1975-09-26
- 1974VEI 0Metodo non indicato1974-07-06 – 1974-07-06
- 1916VEI 0Osservata1916-06-21 – fine sconosciutaJust west of Smith Rock
- 1873VEI 0Metodo non indicato1873-07-02 – fine sconosciuta31.28 N 139.92 E
- 1870VEI 2Osservata1870-05-16 – fine sconosciuta18 km SW of Smith Rock
- 1672VEI 0Metodo non indicato1672 – fine sconosciuta31.58 N 140.25 E
Vulcani nelle vicinanze
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