SYDNEY - A 5.7-MAGNITUDE quake struck in the New Britain region of Papua New Guinea early on Monday morning, the US Geological Survey reported, revising an earlier estimate. There was no immediate tsunami warning.

The quake struck in the Solomon Sea at a depth of seven kilometres at 2.38 am (4.38am Singapore time), with its epicentre 70km south-east of Kandrian and 470km north-east of Port Moresby, the USGS said.

An earlier USGS report estimated the quake's magnitude at 6.1.

The quake struck on the Pacific 'Ring of Fire', where the meeting of continental plates causes high volcanic and seismic activity, in a region frequently struck by powerful earthquakes.

Quake hits Papua New Guinea