Kaikata Seamount
"Kaikata Seamount is a basaltic-to-dacitic submarine volcano located north of Kaitoku Seamount. The volcano rises 2350 m from the sea floor to within 162 m of the sea surface. The seamount contains two major summit peaks oriented NE-SW, with the SW peak being the highest. Hydrothermal activity was observed in 1988 at a depth of 460 m, and the volcano was reclassified as active by the Japan Meteorological Agency."  -Smithsonian Volcano Archive
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