The US Geological Survey said the magnitude 6.1 earthquake was centred 147 kilometers (91 miles) under the sea, 65 kilometres (40 miles) south-southeast of Gorontalo. It shook parts of Gorontalo, North Sulawesi, North Maluku, and Central Sulawesi provinces. No tsunami warning was issued by Indonesia's Meteorology, Climatology and Geophysics Agency.