A strong 6.0-magnitude earthquake shook Indonesia's Papua region early Sunday, the US Geological Survey said.

The quake, which hit at 2:59 am (1759 GMT Saturday), was centred 135 kilometres (85 miles) southwest of the Papuan provincial capital of Jayapura at a depth of 53 kilometres, the USGS was quoted by AFP as saying.

There were no immediate reports of casualties or damage.

The Indonesian archipelago sits on the so-called Pacific Ring of Fire where continental plates meet, causing frequent seismic and volcanic activity.