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The eruption has been seen from space in recent days.

By Patrick Martin and Dana Kirimof, ABC

A volcano is erupting under the ocean in the Bismarck Sea, prompting warnings of possible tsunamis from authorities as ash and smoke bellow into the sky.

Papua New Guinea authorities have warned of falling pumice, ash, unpredictable swells and turbulent currents in the area near the eruption of the provisionally-named Titan Ridge Volcano.