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Kasuga volcanoKasuga volcano is a conical submarine volcano rising 3000 m from the ocean floor to a depth of 598 m, located SE of Fukujin submarine volcano in the Volcano Islands of Japan 1550 km SSE of Tokyo. It is the northernmost of 3 seamounts forming the Kasuga seamounts complex. The Kasuga complex lies in the northern part of a backarc basin west of the Mariana volcanic arc.
Floating pumice was seen south of the volcano location in 1959 and water discolouration above the seamount was reported in November 1975.
Background:Kasuga volcano contains flank vents 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 / GVP volcano information)