The quake struck at 0757 am local time (1257 GMT) about 132 kilometres southeast of Labuha, North Maluku province, at a depth of 56 kilometres, the Indonesian Meteorology and Geophysics Agency said.
The US Geological Survey put the magnitude at 6.4. "There has been no report of casualties so far. There was some shaking felt in several areas but it's not strong," the agency's technical chief Suharjono said.
Indonesia sits on the Pacific "Ring of Fire," where the meeting of continental plates causes high volcanic and seismic activity.
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