List of earthquakes in South Africa
20th and 21st century

Date
Time (SAST)
Epicentre
M_L
Depth
Notes
29 September 1969
-
Near Tulbagh
6.3
-
The 1969 earthquake remains the most destructive earthquake in South African history. The earthquake occurred in the Tulbagh area and measured 6.3 on the Richter scale, stronger than that of the 1809 Cape Town earthquake which destroyed a local Milnerton farm.
8 December 1976
-
Welkom
5.2
-
Four miners were killed.
26 September 1990
-
Welkom
4.2
-
Two people were killed.
9 March 2005
-
Stilfontein, North West
5.3
-
Two miners were killed underground.
28 May 2013
-
Near Mbabane
4.0
-
The earthquake was felt in Newcastle and lasted about six seconds.
22 June 2013
07:08
Thabazimbi, Limpopo
3.9
9 km
The earthquake was felt up in the Thabazimbi area.
7 July 2013
16:52
Barberton, Mpumalanga
4.7
5 km
The earthquake was felt in the Barberton area.
11 November 2013
-
University of Johannesburg, Johannesburg, Gauteng
4.0
-
The earthquake was felt as far as parts of northern and southern Johannesburg and lasted for around 10–15 seconds.
2 December 2013
21:18
~25 km south of Bela-Bela, Limpopo
4.8
5 km
The earthquake was felt as far as Parkhurst and Randburg in Johannesburg, Hartebeespoort Dam in North West, Witbank and KwaMhlanga in Mpumalanga, and Soshanguve near Pretoria.
15 June 2014
18:16
Near Orkney, North West
4.9 MW
5 km
The earthquake was felt up to Potchefstroom.
5 August 2014
12:22
Near Orkney, North West
5.5
5.0 km
The earthquake was felt as far as parts of Botswana and Durban, it lasted for around 90 sec. The local Council for Geoscience measured the earthquake at 5.5 on the Richter scale, while the United States Geological Survey recorded a moment magnitude of 5.4.
22 August 2014
1:14
Near Orange Farm, Gauteng
3.8
10 km
The second earthquake in South Africa in less than three weeks. No reports of injuries.

Question: What's the biggest earthquake in South Africa since the 1969 Tulbagh earthquake?
Answer: The shock was assigned a magnitude of 5.5 on the Richter scale by the Council for Geoscience (CGS) in South Africa, making it the biggest earthquake in South Africa since the 1969 Tulbagh earthquake, which had a magnitude of 6.3 on the Richter scale.