Johannesburg - An earth tremor of 2.2 on the Richter scale occurred early on Wednesday morning on Johannesburg's East Rand, the Council for Geoscience (CGS) said.
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"We were alerted to it this [Wednesday] morning. It was in the Boksburg area at about 05:00," said lead competency manager Michelle Grobbelaar.
"It was about a magnitude of 2.2. It's very surprising that people felt it. It appears it [the tremor] was quite shallow."
She said if an earthquake happens in the middle of the night, people tended to notice it more in comparison to during the day.
On 5 August last year, a 31-year-old man was killed in a mining village near Orkney, North West, when a 5.5 magnitude earthquake struck the region.
At least 34 miners were injured, and more than 600 houses were damaged. At the time, the CGS said more tremors were expected to hit the country in the coming weeks and months.
On 22 August, a separate earthquake measuring 3.8 hit Carletonville, at around 01:14.
"After that, there were several aftershocks," Grobbelar said at the time.
The two major aftershocks were of 3.2 magnitude at 01:15, and two magnitude at 01:16.