The Indonesian Geophysics Agency said that a 7-magnitude earthquake shook the Indonesian region of North Sulawesi on Wednesday.
The agency added that there is no possibility of a tsunami.
However, the Pacific Tsunami Warning Center warned that there was a risk of a tsunami within 300 km of the epicenter.
The Indonesian agency said the epicenter of the quake was at a depth of 64 km, 141 km southeast of the town of Milongwan.
The agency stated that the earthquake was felt in the Moluccas.
A resident of the city of Manado (the capital of North Sulawesi) said - by phone to Reuters - that residents felt the earthquake very strong for several seconds, and people were seen running outside the buildings, but so far no visible damage has been noticed and some people have returned to their homes.
Indonesia is located on the so-called "Pacific Ring of Fire", which makes it one of the most seismically active regions in the world, as it is subject to frequent earthquakes.