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Moderate mag. 4.2 earthquake - 4.2 km east of Fochville, North West, South Africa, on Thursday, Dec 16, 2021 at 2:59 am (GMT +2) -

Moderate mag. 4.2 earthquake - 4.2 km east of Fochville, North West, South Africa, on Thursday, Dec 16, 2021 at 2:59 am (GMT +2) Moderate mag. 4.2 earthquake - 4.2 km east of Fochville, North West, South Africa, on Thursday, Dec 16, 2021 at 2:59 am (GMT +2)

Moderate magnitude 4.2 earthquake at 5 km depth

16 Dec 01:04 UTC: First to report: VolcanoDiscovery after 4 minutes.
16 Dec 01:06: Now using data updates from EMSC
16 Dec 01:29: Magnitude recalculated from 3.1 to 4.2. Hypocenter depth recalculated from 10.0 to 5.0 km (from 6.2 to 3.1 mi). Epicenter location corrected by 7.3 km (4.5 mi) towards SSW.
16 Dec 01:29: Now using data updates from USGS
Update Thu, 16 Dec 2021, 01:33
Moderate magnitude 4.2 quake hits 4 km east of Fochville, South Africa early morning
4.2 quake 16 Dec 2:59 am (GMT +2)
4.2 quake 16 Dec 2:59 am (GMT +2)
An earthquake of magnitude 4.2 occurred 33 minutes ago 4 km east of Fochville, South Africa, the United States Geological Survey reported.
The quake hit at a very shallow depth of 5 km beneath the epicenter near Fochville, North West, South Africa, early morning on Thursday, December 16th, 2021, at 2:59 am local time. Magnitude and other quake parameters can still change in the coming hours as the agency continues to process seismic data.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.2 as well.
Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.
In Fochville (pop. 62,400) located 4 km from the epicenter, the quake should have been felt as light shaking.
Weak shaking might have been felt in Carletonville (pop. 182,300) located 20 km from the epicenter, Westonaria (pop. 156,800) 22 km away, Randfontein (pop. 133,700) 38 km away, Vanderbijlpark (pop. 246,800) 39 km away, and Soweto (pop. 1,695,000) 41 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Vereeniging (pop. 474,700) located 44 km from the epicenter, Roodepoort (pop. 225,000) 50 km away, and Johannesburg (pop. 2,026,500) 60 km away.

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Earthquake data

Earthquake details

Date & timeDec 16, 2021 00:59:56 UTC -
Local time at epicenterThursday, Dec 16, 2021 at 2:59 am (GMT +2)
StatusConfirmed
Magnitude4.2
Depth5.0 km
Epicenter latitude / longitude26.4924°S / 27.536°E (North West, South Africa)
Antipode26.492°N / 152.464°W
Shaking intensityLight shaking
Felt5 reports
Primary data sourceUSGS (United States Geological Survey)
Nearby towns and cities4 km (3 mi) E of Fochville (North-West) (pop: 62,400) | Show on map | Quakes nearby
20 km (12 mi) SE of Carletonville (Gauteng) (pop: 182,300) | Show on map | Quakes nearby
22 km (14 mi) SSW of Westonaria (Gauteng) (pop: 156,800) | Show on map | Quakes nearby
38 km (24 mi) SSW of Randfontein (Gauteng) (pop: 133,700) | Show on map | Quakes nearby
39 km (24 mi) NW of Vanderbijlpark (Gauteng) (pop: 246,800) | Show on map | Quakes nearby
41 km (25 mi) SW of Soweto (Gauteng) (pop: 1,695,000) | Show on map | Quakes nearby
44 km (27 mi) WNW of Vereeniging (Gauteng) (pop: 474,700) | Show on map | Quakes nearby
50 km (31 mi) SW of Roodepoort (Gauteng) (pop: 326,400) | Show on map | Quakes nearby
60 km (37 mi) WSW of Johannesburg (Gauteng) (pop: 2,026,500) | Show on map | Quakes nearby
106 km (66 mi) SW of Pretoria (Gauteng) (pop: 1,619,400) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 18.3°C (65 F), humidity: 66%, wind: 2 m/s (3 kts) from NNW
Estimated seismic energy released1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tons of TNT) | 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.
Mag.DepthLocationSource
4.25 km4 Km E of Fochville, South AfricaUSGS
4.25 kmSOUTH AFRICAEMSC
4.25 kmSouth AfricaRaspberryShake
3.210 kmSouth Africa RegionCGS

User reports for this quake (7)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Johannesburg south South Africa (52.3 km ENE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Sitting on my bed and felt the house shake 3:00 am 16 December 2021 | One user found this interesting.  
Johannesburg South - Ridgeway / Light shaking (MMI IV) : I was asleep, the quake woke me. Unsure of it's duration or intensity. My pet birds were a little shaken up.  
Randburg, City of Johannesburg Metropolitan Municipality, Gauteng (61.9 km NE of epicenter) [Map] / not felt (reported through our app)
Roodepoort, City of Johannesburg Metropolitan Municipality, Gauteng (51.5 km NE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 10-15 s : House shaked  
Westonaria / Weak shaking (MMI III) / single vertical bump / very short
Florida, ROODEPOORT / not felt (reported through our app)
EMMARENTIA / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : light shaking  
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