Global Volcanism Program | Image GVP-09554
Discolored water from a submarine eruption in September 2001 surrounds Ioto. The island is located within a 9-km-wide submarine caldera and narrows toward its SW tip, where the Suribachiyama cone is located. The yellow arrow marks the site of the 2001 submarine vent. Ioto has undergone uplift for at least the past 700 years accompanying resurgent doming of the caldera. Numerous historical phreatic eruptions have accompanied the uplift.
Photo by Nakahori, 2001 (Japan Meteorological Agency, published in the Bulletin of the Global Volcanism Network).