The epicenter of the quake was around 29 kilometers (18 miles) southeast of Bolaang Mongondow Regency at a depth of 105 kilometers (65.2 miles), according to the Meteorology, Climatology and Geophysical Agency.
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The agency has not issued a tsunami alert after the quake.
There were no immediate reports of casualties.
In 2018, a magnitude 7.4 earthquake struck the country's Sulawesi Island, triggering a tsunami that towered up to 3 meters (10 feet) high and killed over 2,000 people.
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