He added there was no damage in Rabaul, but officers were still waiting to hear from villages closer to the epicentre.
A Pacific-wide tsunami is not expected and there is no tsunami threat to Hawaii, the Pacific Tsunami Warning Center said in a bulletin.
In March, a magnitude-6.6 quake struck nearby but no casualties or damage was reported.
A magnitude 7.0 natural disaster struck remote New Britain island in Papua New Guinea on Thursday, the United States Geological Survey said, though there were no immediate reports of damage.
"A tsunami threat exists for parts of the pacific located closer to the quake", the Pacific Tsunami Warning Centre said, but added more information was needed to assess if the risk radiated further.
"A tsunami threat exists for parts of the Pacific located closer to the quake", the Pacific Tsunami Warning Center said in a bulletin.
It later revised its forecast saying: 'Based on all available data the tsunami threat from this quake has now passed'.
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Papua New Guinea, one of the world's poorest countries, sits on the geologically active Pacific Ring of Fire and is still recovering from a magnitude-7.5 quake that hit some 900km to the west in February, killing at least 100 people.
The strong quake was felt in Denpasar on the holiday island of Bali, where panicked people fled from buildings.
A magnitude 6.2 aftershock was recorded over an hour after the original quake struck, according to the U.S. Geological Survey.
Indonesia's disaster agency says the September 28 disaster that hit Sulawesi Island has killed 2045 people.
Strong earthquakes struck Papua New Guinea and the Indonesian island of Bali on Thursday, but there were no immediate reports of major damage.
Some tourists and residents ducked outdoors as a precaution but then went back to sleep when there was no tsunami warning.