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Minami Kasuga
"Minami Kasuga (South Kasuga) is the central of three NNE-SSW trending volcanoes forming the Kasuga seamount chain, which trends SSE from the volcanic front of the Izu-Marianas arc. Minami Kasuga (also referred to as Kasuga 2) rises from about 3000 m depth to within 170 m of the sea surface and is the highest and largest volume of the three volcanoes. Two subsidiary cones are located low on the eastern flank. The morphology of Minami Kasuga is more complex than Kasuga 1 volcano to the north, and prominent ridges separate slopes of interspersed volcaniclastic and lava flow fields. Radionuclide decay rates indicate an age for Minami Kasuga of less than 8000 years and probably less than 1000 years; radium/thorium disequilibrium ratios suggest the flows may be only a few centuries old (Fryer et al., 1997). Active hydrothermal fields are located at the summit of Minami Kasuga, at the base of summit ridges, and on the lower flanks."  -Smithsonian Volcano Archive
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