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Very strong mag. 6.0 earthquake - Indian Ocean, South Africa, on Saturday, Dec 18, 2021 at 10:05 pm (GMT +2) -

Very strong mag. 6.0 earthquake - Indian Ocean, South Africa, on Saturday, Dec 18, 2021 at 10:05 pm (GMT +2) Very strong mag. 6.0 earthquake - Indian Ocean, South Africa, on Saturday, Dec 18, 2021 at 10:05 pm (GMT +2)

Very strong magnitude 6.0 earthquake at 10 km depth

18 Dec 20:17 UTC: First to report: GFZ after 12 minutes.
18 Dec 20:18: Epicenter location corrected by 3.8 km (2.3 mi) towards SW.
18 Dec 20:26: Now using data updates from USGS

Earthquake details

Date & timeDec 18, 2021 20:05:44 UTC -
Local time at epicenterSaturday, Dec 18, 2021 at 10:05 pm (GMT +2)
Depth10.0 km
Epicenter latitude / longitude47.1°S / 33.4549°E (Indian Ocean, South Africa)
Antipode47.1°N / 146.545°W
Shaking intensityStrong shaking near epicenter
Felt1 report
Primary data sourceUSGS (United States Geological Survey)
Nearby towns and cities
Weather at epicenter at time of quakeOvercast Clouds 6.2°C (43 F), humidity: 91%, wind: 8 m/s (15 kts) from WSW
Estimated seismic energy released6.3 x 1013 joules (17.5 gigawatt hours, equivalent to 15080 tons of TNT or 0.9 atomic bombs!) | about seismic energy
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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.
6.010 kmSouth Africa: Prince Edward Islands RegionUSGS
5.610 kmSouth Africa: Prince Edward Islands RegionRaspberryShake
5.110 kmSouth Africa: Near Port ElizabethRENASS
5.910 kmSouth Africa: Prince Edward Islands RegionGFZ
5.810 kmSouth Africa: Prince Edward Islands RegionGeoAu


Seismic station: Lobatse, Botswana (LBTB/GT network) | Distance from quake: 2552 km / 1586 mi | Show on map | Station Info
Seismic station Lobatse, Botswana: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (5)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
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Send your own user report!
Port Shepstone, Ugu District Municipality, KwaZulu-Natal (1832.8 km N of epicenter) [Map] / not felt (reported through our app)
Durban, EThekwini Metropolitan Municipality, KwaZulu-Natal (1931.1 km N of epicenter) [Map] / not felt (reported through our app)
Parkmore, Sandton (2383.9 km NNW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 5-10 s : Vibrating floor and windows  
Durban / not felt : Did not feel a thing (reported through our app)  
Vape Town / not felt (reported through our app)


[More info]

Recorded aftershocks, latest first (1 quake)

Date and timeMag
Apr 30, 2022 01:13
32 weeks ago

10 km
Indian Ocean, South AfricaMore

Earlier earthquakes in the same area

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