The massive quake struck off the coast of Papua New Guinea
The tremor happened 29 miles west of the Arawa, on Bougainville island, according to the United States Geological Survey.
The Pacific Tsunami Warning Centre said a widespread tsunami is possible following the quake.
The Pacific Tsunami Warning Center said in an advisory that "widespread hazardous tsunami waves are possible" as a result of the earthquake for the next three hours along the coasts of Papua New Guinea, the Solomon Islands, Nauru, Pohnpei, Kosrae, Vanuatu, Chuuk and Indonesia.
More to follow.