A strong earthquake has struck near a major town in the Pacific nation of Papua New Guinea, the United States Geological Survey said.

The 6.7-magnitude quake occurred on Friday about 100 kilometers east of Lae, on the country's northern coast at a depth of 63 kilometres, according to the USGS.

There were no immediate reports of damage or injuries and no tsunami alert had been issued.

Papua New Guinea lies on the "Ring of Fire", an arc of earthquake and volcanic zones that stretches around the Pacific Rim where about 90 per cent of the world's quakes occur.

Source: Agencies