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A strong 6.9-magnitude earthquake has struck off Papua New Guinea's Bougainville Island but there is no risk of a widespread tsunami, seismologists say.
The quake hit at 0104 GMT (1104 AEST) on Saturday and was centred 62km southwest of the town of Panguna on Bougainville at a depth of 45km, the US Geological Survey said.
In its initial estimate, the USGS said there was a low likelihood of casualties and damage.
According to the Hawaii-based Pacific Tsunami Warning Centre there was no threat of a destructive widespread tsunami based on historical data.
Geoscience Australia measured the quake at magnitude 7.0 and said it was probably felt within a wide radius, with the potential for localised shaking damage.