According to the United States Geological Survey (USGS), the quake occurred 144-km East of Kimbe, Papua New Guinea.
The Pacific Tsunami Warning Center initially issued a tsunami warning for the coasts of Papua New Guinea, though the threat had passed without incident almost two hours later.
"Government agencies responsible for threatened coastal areas should take action to inform and instruct any coastal populations at risk", the PTWC said in its alert.
A magnitude 6.9 natural disaster struck off the southern coast of Papua New Guinea's New Britain island on Friday, initially triggering a tsunami warning for surrounding coastlines, but there were no immediate reports of casualties or damage.
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Home to seven million people, Papua New Guinea is east of Indonesia and north of Australia's east coast.
It is the third natural disaster to have hit the region in 24 hours, each one increasing in strength. About 90 per cent of the world's earthquakes, and 81 per cent of the largest earthquakes occur in this area.
Roads and houses are still being rebuilt from last month's natural disaster.
And countries across the blog stretching from Chile in South America to New Zealand are preparing for more chaos and possible aftershocks and tremors after weeks of eruptions and quakes.