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The Japanese coast guard released dramatic video of the new land mass forming from an undersea volcano near the uninhabited Nishinoshima Island.
The as-yet-unnamed atoll measures about 660 feet in diameter and sits just off the coast of the uninhabited Nishinoshima Island, which is part of the Bonin Islands chain, according to the Japanese coast guard.
The 30 islands are more than 600 miles south of Tokyo and are part of the Pacific "Ring of Fire."
The coast guard issued an advisory Wednesday warning of heavy black smoke in the area. Television footage released Thursday shows smoke, ash and rocks billowing from a dark crater surrounded by sky-blue water.
Japanese officials aren't sure if they're going to name it yet.
Japanese volcanologist Hiroshi Ito told FNN News that the new island may disappear back under the waves, but said it "could also remain permanently."
The volcanoes that built Japan's newest island last erupted in the mid-1970s.