Shallow quake measuring 6.1 magnitude strikes off PNG - USGS
The tremor, centred 110 km (68 miles) southwest of the town of Arawa on Bougainville, was just 1 km (0.6 miles) deep.
The region has been rocked by numerous strong earthquakes in recent weeks, the strongest measuring magnitude 7.5 on April 19.
(Reporting by Lincoln Feast; Editing by by Ron Popeski)