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, 01:33Moderate magnitude 4.2 quake hits 4 km east of Fochville, South Africa early morning
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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