Johannesburg - A 4.6 magnitude earthquake hit Johannesburg in the early hours of Friday morning, the US Geological Survey said on its website.

The quake, which happened around 1am, is the second in South Africa in less than three weeks.

It occurred 12 kilometres west of Orange Farm, a township south of Johannesburg.

On August 5, a 31-year-old man was killed in a mining village near Orkney, North West when the 5.5 magnitude earthquake struck the region.

At least 34 miners were injured by the earthquake, and more than 600 houses were damaged. - Sapa