A 6.5-magnitude undersea earthquake struck off the western coast of Indonesia's Sumatra island late Friday, seismologists said.
The quake struck at 11:07 pm (1607 GMT) at a depth of 10 kilometres, about 119 kilometres south-east of Mentawai Islands, Indonesia's National Meteorological and Geophysics Agency (BMG) said.
There were no immediate reports of injury or structural damage from the quake, the latest to jolt Indonesia in recent weeks, dpa reported,
In September last year a powerful 7.6-magnitude quake struck off the western coast of Sumatra, killing thousands of people and injuring hundreds of others.
A major earthquake and subsequent tsunami struck in December 2004, leaving more than 170,000 people dead or missing and half a million people homeless in Indonesia's Aceh province.