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is a submarine volcano located about 450 kilometers south of Tokyo on the Izu-Ogasawara Ridge in the Izu Islands. Volcanic activity has been detected there since 1869. Since then it has undergone more eruptions, the most powerful of which resulted in the appearance and disappearance of a small island. The name Myōjin-shō derives from a fishing boat, ''No.11 Myōjin-Maru'' of Yaizu City, Shizuoka Prefecture, the crew of which first witnessed the major volcanic eruption of 1952. ==Eruption of 1952-3== The volcanic eruption from 1952 to 1953 was one of its biggest eruptions on record, with the repetitious appearance and disappearance of an island, which at one point reached over ten metres above sea level, before sinking after a major volcanic eruption in September 1953. On September 24, 1952, a survey vessel, ''Kaiyo Maru No. 5'' of the Hydrographic Department of the Maritime Safety Agency, was destroyed by the volcano, with the loss of its crew of 31 (including the nine scientists studying the eruption). Consequently, the Department developed ''Manbou'' (Sunfish), an unmanned radio operating survey boat, and has used it for the research of dangerous sea areas such as submarine volcanoes. This was the first time that volcanic activity had been detected using the SOFAR channel.〔http://www.gsajournals.org/perlserv/?request=get-abstract&doi=10.1130%2F0016-7606(1954)65%5B941%3ATDOMVE%5D2.0.CO%3B2 "Transpacific detection of Myojin volcanic explosions by underwater sound"〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Myōjin-shō」の詳細全文を読む スポンサード リンク
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