Jakarta - A magnitude-6.1 earthquake struck off the western coast of Indonesia's Sumatra island Wednesday, but there were no immediate reports of injuries and damage, seismologists said. The quake struck at 8:11 am (0111 GMT) at a depth of 10 kilometres about 56 kilometres south-east of the Mentawai Islands, Indonesia's National Meteorological and Geophysics Agency said.
A magnitude-5.3 aftershock followed about 35 minutes later in the latest earthquakes to jolt Indonesia in recent weeks, the agency said.
On September 30, a magnitude-7.6 quake also 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, also off Sumatra, leaving more than 170,000 people dead or missing in Indonesia's Aceh province and sending deadly tsunami waves washing up on other shores across the Indian Ocean.
