Global Volcanism Program | Image GVP-10589
Kasuga, the northernmost of three seamounts in the Kasuga seamount chain (and also known as Kasuga 1), rises to within about 600 m of the sea surface SE of Fukujin submarine volcano. A series of flank vents are located low on the southern side of the edifice. Pumice from a submarine eruption was witnessed in 1959.
Image courtesy of NOAA, 2003 (http://oceanexplorer.noaa.gov/explorations/03fire/logs/mar02/media/kasuga.html).
This image is made available as a Public Domain Work, but proper attribution is appreciated.