A 6.6 magnitude earthquake struck off western Indonesia's Sumatra Island on Thursday, the US Geological Survey (USGS) said.
The quake struck at 4.56 am, with a depth of 25.4 kilometers (15.7 miles), 45 km (27.9 miles) west-northwest of Sinabang town on the east coast of Simeulue Island.
There were no reports of damage or casualties when this report was published.
