SYDNEY – An earthquake with a magnitude of 6.5 was recorded off the Indonesian island of Sumatra on Thursday, the US Geological Survey reported.

Tremors were felt in various parts of Singapore including the east coast, Hougang and Sengkang.

The quake was centred about 155 km (95 miles) south of the Sumatran port city of Padang at a depth of about 50 km (30 miles), the USGS said. It had originally been reported with a magnitude of 6.2.

There were no immediate reports of damage or injury.

In December 2004, a massive 9.15 magnitude undersea quake triggered an Indian Ocean tsunami that killed more than 200,000 people in a dozen countries. Most of those killed were in the province of Aceh on Sumatra’s northwest tip.

Indonesia straddles the so-called “Pacific Ring of Fire”, a highly seismically active zone, where different plates on the earth’s crust meet and create a large number of earthquakes and volcanoes.