A powerful 6.0-magnitude earthquake struck at sea off Indonesia's Sumatra island, the US Geological Survey said Friday, but there were no immediate reports of damage or injuries.
The quake struck 141 kilometres (88 miles) southwest of the city of Bengkulu at a depth of 35 kilometres at 3:50 pm (0850 GMT), the USGS said in an email alert.
A geologist at Indonesia's geophysics agency told AFP no tsunami alert had been issued for the quake.
"We don't know yet of any damage from the quake," Edison Gurning said.
Bengkulu city was badly damaged in a 8.4-magnitude quake that killed 23 people in September 2007.
Indonesia was the country worst hit by the earthquake-triggered tsunami in December 2004 that killed more than 200,000 people in 11 nations across Asia, including over 168,000 people in Indonesia's Aceh province alone.
This month, it launched a high-tech tsunami warning system in a bid to prevent a repeat of the tragedy.
The Indonesian archipelago straddles several continental plates in an area known as the Pacific Ring of Fire, where seismic and volcanic activity is recorded on an almost daily basis.
Earlier this month, six people were killed and some 10,000 displaced by a powerful 7.5-magnitude earthquake which struck Sulawesi island.
