It was centred about 68 kilometres northeast of Tadine in what are known as the Loyalty Islands.
An undersea natural disaster of magnitude 7.0 has struck 82 kms east of New Caledonia's Loyalty Islands, prompting a tsunami warning for coastlines within 300km of the epicentre.
The tremor hit at a depth 25 kilometres some 85 kilometres to the east of the lightly populated Loyalty Islands, initial data from the survey said.
There was no immediate news on damage or casualties.
"Minor sea level fluctuations.may continue over the next few hours", a statement from the agency said.
"Based on current information, the initial assessment is that the quake is unlikely to have caused a tsunami that will pose a threat to New Zealand". "Tsunami waves have been observed", the USGS said.
However, the New Zealand Ministry of Civil Defence and Emergency Management says that their initial assessment indicates there is "no tsunami threat" there in the wake of the natural disaster.
A magnitude 7.3 quake has struck near New Caledonia and Vanuatu, sparking warnings of hazardous tsunami waves.