Doyō Seamount

Doyo is the southernmost of the Shichiyo Seamounts, named for the seven days of the week. Doyo ("Saturday") is a basaltic andesite submarine volcano that rises 2,340 m from the sea floor to within less than 600 m of the surface. An open collapse scarp is 3 x 10 km. Major hydrothermal activity was observed in July 1990, and the volcano was reclassified as active by the Japan Meteorological Agency.