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Bayonnaise Rocks
is a group of volcanic rocks in the Philippine Sea about south of Tokyo and south-southeast of Aogashima, in the south portion of the Izu archipelago, Japan. The rocks were discovered by the French corvette ''Bayonnaise'' in 1846.
==Geography==
The rocks are the exposed portion of the western〔Christopher G. Newhall, Daniel Dzurisin: ''Historical Unrest at large Calderas of the World.'' Volume 1, U.S. Geological Survey Bulletin 1855, Washington 1988, p. 506; (Bathymetric map around "Bayonnaise Rocks" based on Basic Map of the Sea ) (1:50.000, retrieved 2012-12-13).〕 ridge of a submarine volcanic caldera, approximately in diameter at a depth of approximately . The above sea-level portion has a surface area of approximately 0.01 square kilometers, with a summit height of . The caldera is known to have erupted in 1896, 1906, 1915, 1934, 1946, 1952-1953, 1954, 1955, 1957, 1958, 1959, and 1960. The last known submarine eruption of the caldera was in 1970, which discolored the local water.
On the northeast rim of the same caldera to the east of the Bayonnaise Rocks is a submerged reef named , which is a post-caldera cone with a depth of approximately . During a submarine volcanic eruption of 17 September 1952, an ephemeral island was formed, with a height of , which was created and destroyed several times by volcanic activity until completely disappearing on 3 September 1953.
The 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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