A magnitude 7.3 earthquake that struck west of Indonesia’s Sumatra Island has triggered a tsunami warning that lasted for about two hours.

The tsunami warning, asking local authorities to immediately instruct residents of the affected area to move away from shores, has since been lifted.

The European-Mediterranean Seismological Centre (EMSC) had earlier pegged the quake at 6.9 magnitude.

The quake, at a depth of 84 kilometres, hit about 3am on Tuesday. A number of aftershocks were detected later, and one registered 5.0 magnitude Indonesia’s geophysics agency data showed.

Tweet from @BOM_au

The agency said authorities were collecting data from the islands nearest the epicentre off the western shore of Sumatra, spokesperson Abdul Muhari said.

In Padang, the capital of West Sumatra, the quake was felt strongly, and some people moved away from the beaches, said Abdul, who was in Padang.

“People left their homes. Some were panicking but under control. Currently some of them are evacuating away from the sea,” he said, adding he had seen no damage so far.

Local news footage showed some Padang residents evacuating by motorbike and foot to higher ground. Some carried backpacks while others huddled together under an umbrella against the rain.

“On the Siberut island, people had already been evacuated. They have been told to stay at the evacuation area until tsunami warning is lifted,” Noviandri, a local official told TvOne.

Indonesia suffers frequent earthquakes because it straddles the Pacific Ring of Fire, a seismically active zone where different plates of the earth’s crust meet.

– AAP