Moderate mag. 4.4 earthquake - 19 km east of Stilfontein, South Africa, on Friday, Sep 17, 2021 at 7:33 am (GMT +2) -
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Moderate magnitude 4.4 earthquake at 5 km depth
18 Sep 05:02 UTC: First to report: USGS after 23 hours.
Earthquake details
| Date & time | Sep 17, 2021 05:33:31 UTC - |
| Local time at epicenter | Friday, Sep 17, 2021 at 7:33 am (GMT +2) |
| Status | Confirmed |
| Magnitude | 4.4 |
| Depth | 5.0 km |
| Epicenter latitude / longitude | 26.8983°S / 26.9515°E  (Dr Kenneth Kaunda District Municipality, North West, South Africa) |
| Antipode | 26.898°N / 153.049°W |
| Shaking intensity | Moderate shaking near epicenter |
| Felt | 0 reports |
| Primary data source | USGS (United States Geological Survey) |
| Nearby towns and cities | 19 km (12 mi) ESE of Stilfontein (North-West) (pop: 93,100) | Show on map | Quakes nearby 25 km (16 mi) SW of Potchefstroom (North-West) (pop: 123,700) | Show on map | Quakes nearby 29 km (18 mi) E of Klerksdorp (North-West) (pop: 178,900) | Show on map | Quakes nearby 29 km (18 mi) ENE of Orkney (North-West) (pop: 145,800) | Show on map | Quakes nearby 34 km (21 mi) N of Viljoenskroon (Orange Free State) (pop: 55,000) | Show on map | Quakes nearby 50 km (31 mi) W of Paris (Free State) (pop: 71,300) | Show on map | Quakes nearby 114 km (71 mi) SW of Soweto (Gauteng) (pop: 1,695,000) | Show on map | Quakes nearby 133 km (83 mi) SW of Johannesburg (Gauteng) (pop: 2,026,500) | Show on map | Quakes nearby 174 km (108 mi) SE of Mahikeng (North-West) (pop: 14,000) | Show on map | Quakes nearby 178 km (111 mi) SW of Pretoria (Gauteng) (pop: 1,619,400) | Show on map | Quakes nearby |
| Estimated seismic energy released | 2.5 x 1011 joules (69.8 megawatt hours, equivalent to 60 tons of TNT) | about seismic energy |
Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
| Mag. | Depth | Location | Source |
| 4.4 | 5 km | 19 Km ESE of Stilfontein, South Africa | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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