A moderate 5.6-magnitude earthquake struck off Indonesia's North Sulawesi province Thursday but there were no immediate reports of damage and no tsunami warning was issued, officials said.

The quake struck at 8:14 am (0114 GMT), 196 kilometres (121 miles) southeast of Melonguane at a depth of 53 kilometres (32 miles), the meteorology and geophysics agency said.

Indonesia sits on the Pacific "Ring of Fire," where the meeting of continental plates causes high volcanic and seismic activity.

A 7.6-magnitude quake that struck Sumatra island on September 30 killed more than 1,000 people.