Sydney: A 5.7-magnitude earthquake struck off Papua New Guinea in the early hours today, US geologists said, but there were no warnings it had triggered a tsunami.

The quake hit around 58 kilometres southwest of Taron, Papua New Guinea at a depth of 50 kilometres at around 1930 GMT (yesterday), the US Geological Survey said on its website.

There were no initial reports of damage.

The Hawaii-based Pacific Tsunami Warning Center had no tsunami warning on its website.