page_title: Myōjin-shō
section_title: Eruption of 1952-1953
hierarchical_section_title: Myōjin-shō / Eruption of 1952-1953
caption_attribution_description: English: Eruption of Myojin-Sho submarine volcano from patrol vessel Shikine of the Maritime Safety Agency 日本語: 噴煙を上げる明神礁とそれを眺める船員
context_page_description: Myōjin-shō 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.
context_section_description: 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.
caption: A mysterious reef raised a volcanic plume and "Chihuri-class patrol vessel" sailors looked at it (1952)
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