A magnitude-7.5 earthquake has struck off Papua New Guinea, prompting a tsunami warning to be briefly issued for the Pacific Island nation and neighbouring Solomon Islands.
The quake struck 68 kilometres south-west of Panguna on the island of Bougainville, the US Geological Survey (USGS) said. The USGS, revising down the magnitude from an initial 7.8, said the quake hit at a depth of 10 kilometres.
There were no immediate reports of damage. A tsunami warning was issued for PNG and the Solomon Islands by the Pacific Tsunami Warning Centre, but it later cancelled the alert.
The Pacific Warning Centre said there was no threat to neighbouring Australia or other countries across the Pacific Ocean.