"A table of possible submarine eruptions based on aerial observations of water discoloration by the Japanese Maritime Safety Agency included an entry for 26.13°N, 144.48°E, in March 1974. This location is about 330 km ENE of Kita-Iwo-jima. The depth in this area on the Ogasawara Plateau is about 3200 m. The existence of an active submarine volcano at this location is uncertain."  -Smithsonian Volcano Archive
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