An earthquake measuring 7.3 struck near the Indonesian island of Sulawesi rising fears of tsunami.
The quake was centred in the Molucca Sea, according to the US Geological Survey.
Indonesian officials put the quake strength at 6.5 and said it could pose a tsunami risk, but no official warning was issued.
A spokesman for the Pacific Tsunami Warning Center said there were dangers of a "localised" tsunami, stretching from 100-200km (62-124 miles) from the epicentre.
Indonesia was the worst-hit country in the Indian Ocean tsunami of December 2004, which killed more than 160,000 people in Aceh province.