The Pacific Tsunami Warning Centre said waves reaching 1 to 3 metres above the tide level were possible in coastal areas of Papua New Guinea for the next several hours.
Waves of less than 0.3m above the tide level were forecast for some other areas of the Pacific, including Indonesia, Solomon Islands, Nauru and Vanuatu.
Civil Defence said there was no tsunami threat to New Zealand, including the Chatham Islands.
An advisory to stay out of the water and away from beaches was issued after the earthquake but later cancelled, based on the analysis of additional data.
