Johannesburg Emergency Management Services (EMS) say tremors like the one felt in parts of the city Monday night are happening more often.
Many residents reported feeling the tremor at around 7pm.
No damage to property has been reported.
Johannesburg EMS spokesperson, Robert Mulaudzi says the scale of the tremor is not yet known.
“The earth tremor was reported in most parts of the City of Joburg, mostly in the southern and western parts. At this stage there are no injuries or damages which have been reported. Our emergency units will be on high alert throughout the night.”
“We want to urge our residents throughout the city to be more vigilant because it looks like these tremors are more frequent now. At this stage the magnitude of the tremor is yet to be measured and we don’t know the cause,” adds Mulaudzi.