Jakarta, Jan 18 (Agencies): A 5.8-magnitude earthquake struck off the coast of Indonesia's Sumatra island, the US Geological Survey said on Tuesday, but there were no tsunami warnings issued.

The undersea quake hit at a depth of 34 km, 158 km southeast of Bengkulu on Sumatra, at 2:20 am (0050 IST) the USGS said.

There were no tsunami warnings in place according to the Hawaii-based Pacific Tsunami Warning Center.

Indonesia sits on the Pacific "Ring of Fire", where the meeting of continental plates causes high seismic activity, and Sumatra is particularly prone to earthquakes.