"Kasuga seamount is a conical volcano that rises to within 598 m of the sea surface SE of Fukujin submarine volcano. Kasuga is listed as an active volcano by the Japan Meteorological Agency, and floating pumice attributed to a submarine eruption of Kasuga was seen south of the volcano in the summer of 1959. Water discoloration from a possible submarine eruption was reported from a location near Kasuga seamount in November 1975. Kasuga, the northernmost of three seamounts in the the Kasuga seamount chain, rises from a depth of 3000 m. A series of flank vents are located low on the southern side of the edifice. The summit of Kasuga does not have a caldera or display hydrothermal activity, and the volcano is largely mantled by volcaniclastics. Altered basaltic and andesitic rocks dredged from the summit suggest that Kasuga 1 is the oldest of the three seamounts, although delicately preserved lava flow lobes and toes from a flank eruption suggest a very youthful age."  -Smithsonian Volcano Archive
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