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Doyo Seamount
"Doyo Seamount is the southernmost of the Shichiyo Seamounts, named for the 7 days of the week. Doyo ("Saturday") is a basaltic-andesite submarine caldera that rises 2340 m from the sea floor to within 860 m of the sea surface. The large horseshoe-shaped summit caldera is 3 x 10 km wide. Major hydrothermal activity was observed in July 1990, and the volcano was reclassified as active by the Japan Meteorological Agency."  -Smithsonian Volcano Archive
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