An earthquake with a magnitude of 6.3 struck off the southeastern Indonesia coast on Monday evening, the US Geological Survey said.

The epicentre of the quake, which occurred at 6.43pm on Monday (1143 GMT), was located in the Banda Sea 139 km (86 miles) southeast of the town of Ambon, USGS reported. It took place at a depth of 34 km.

Indonesia sits on the Pacific "Ring of Fire" where continental plates collide, causing frequent seismic and volcanic activity.

An 8.7 earthquake that struck west of Indonesia in April was the biggest of its kind ever recorded and confirms suspicions that a giant tectonic plate is breaking up, scientists said in September.