A magnitude-6.9 earthquake has struck off Papua New Guinea, the United States Geological Survey says.
There were no immediate reports of damage or casualties caused by the earthquake, which was centred in the Pacific Ocean, 154 kilometres south of Rabaul at a depth of 85 kilometres.
No tsunami alert has been issued.
Rabaul, a town on East New Britain Island, lies in the shadow of Mount Tavurvur, an active volcano.
The town was destroyed in 1994 during a severe eruption.