Earthquake hits South Africa; buildings shake in Johannesburg, but no reports of casualties

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A 5.3 earthquake has shaken buildings in Johannesburg and surrounding areas.

There are no immediate reports of casualties following the tremor Tuesday. The U.S. Geological Survey says it had a magnitude of 5.3. The quake was also felt in Pretoria, the South Africa capital, and Hartbeespoort, a nearby resort town. The USGS said the quake was centered in Orkney, 170 kilometers (105 miles) southwest of Johannesburg.

The area has periodic, moderate tremors, though the quake on Tuesday was one of the strongest in recent years.

Quakes are a concern to mining companies that operate around Johannesburg. Mining is a traditional pillar of industry in South Africa.