Magnitude 6.3 Earthquake Hits Off Papua New Guinea

A magnitude 6.3 earthquake struck off the coast of Papua New Guinea's Bougainville Island early Tuesday, U.S. seismologists said, with no immediate tsunami warning issued. 

The quake hit some 96 kilometers (60 miles) southwest of Panguna at 0019 GMT, according to the U.S. Geological Survey.

The epicenter was 104 kilometers southwest of the larger town of Arawa also on Bougainville Island and USGS said it was 30 kilometers deep, which is considered shallow.

The seismologists had earlier reported the quake's strength at 6.7 magnitude, but later revised the figure. 

The Hawaii-based Pacific Tsunami Warning Center had no warnings on its website after the quake.

Quakes are common on the island nation, which lies on the 4,000-kilometer-long Pacific Australia plate, which forms part of the "Ring of Fire", a hotspot for seismic activity due to friction between tectonic plates.