Jakarta - A strong undersea earthquake struck off the western coast of Indonesia's Sumatra island late Wednesday afternoon, but there were no immediate reports of injury and damage, seismologists said. The quake, measuring at 7.6 on the Richter scaled, struck at 5:16 pm (1016 GMT) at a depth of 71 kilometres, about 57 kilometres south-west of Pariaman on West Sumatra province, Indonesia's National Meteorological and Geophysics Agency (BMG) said.
The agency said there were no immediate reports of injury or structural damage from the quake.
Indonesia, the world's largest archipelago, sits on the Pacific "Ring of Fire," the edge of a tectonic plate prone to seismic upheaval.
A major earthquake and subsequent tsunami struck in December 2004, leaving more than 170,000 people dead or missing in Indonesia's Aceh province and half a million people homeless.
