Wed . 18 Dec 2018

Bayonnaise Rocks

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Bayonnaise Rocks ベヨネース列岩, Beyonēsu-retsugan is a group of volcanic rocks in the Philippine Sea about 408 kilometres 254 mi south of Tokyo and 65 kilometres 40 mi south-southeast of Aogashima, in the south portion of the Izu archipelago, Japan The rocks were discovered by the French corvette Bayonnaise in 1850 while surveying the island south of Tokyo Bay1


  • 1 Geography
  • 2 See also
  • 3 References
  • 4 External links


The rocks are the exposed portion of the western ridge of a submarine volcanic caldera, approximately 9 kilometres 56 mi in diameter at a depth of approximately 1,000 metres 3,300 ft2 The above sea-level portion has a surface area of approximately 001 square kilometers, with a summit height of 11 metres 36 ft and consists of three large rocks and many smaller rocks 1

The caldera is known to have erupted in 1869, 1870, 1871, 1896, 1906, 1915, 1934, 1946, 1952-1953, 1954, 1955, 1957, 1958, 1959, 1960, and 1970 The last known submarine eruption of the caldera was in 1988, which discolored the local water1

On the northeast rim of the same caldera 128 kilometres 80 mi to the east of the Bayonnaise Rocks is a submerged reef named Myōjin-shō 明神礁, which is a post-caldera cone with a depth of approximately 50 metres 160 ft During a submarine volcanic eruption of 17 September 1952, an ephemeral island was formed, with a height of 10 metres 33 ft, which was created and destroyed several times by volcanic activity until completely disappearing on 23 September 1953 The following day, an eruption killed 31 researchers and crewmen abroad the Maritime Safety Agency survey ship No5 Kaiyo-Maru The island reappeared on 11 October, sinking again on 11 March 1954 and reappeared one more time between 5 April and 3 September 19541

Vegetation is sparse among the Bayonnaise Rocks The islands are a resting place for migratory birds Located in the Kuroshio Current, the area has abundant sea life, and is popular with sports fishermen

See alsoedit

  • Tokyo portal
  • Izu Islands


  1. ^ a b c d "66 Beyonesu Bayonnaise Rocks including Myojinsho" PDF Japan Meteorological Agency Retrieved 26 March 2017 
  2. ^ Christopher G Newhall, Daniel Dzurisin: Historical Unrest at large Calderas of the World Volume 1, US Geological Survey Bulletin 1855, Washington 1988, p 506; Bathymetric map around "Bayonnaise Rocks" based on Basic Map of the Seapermanent dead link 1:50000, retrieved 2012-12-13

External linksedit

Media related to Bayonnaise Rocks at Wikimedia Commons

  • "Beyonesu Bayonnaise Rocks: National catalogue of the active volcanoes in Japan" PDF  - Japan Meteorological Agency
  • Myojinsho: Global Volcanism Program - Smithsonian Institution
  • Bayonnaise Rocks Volcano - volcanolivecom

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