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Strong mag. 5.7 earthquake - 10.2 km west of Welkom, South Africa, on Thursday, April 22, 1999 at 22:19 GMT

Strong mag. 5.7 earthquake - 10.2 km west of Welkom, South Africa, on Thursday, April 22, 1999 at 22:19 GMT Strong mag. 5.7 earthquake - 10.2 km west of Welkom, South Africa, on Thursday, April 22, 1999 at 22:19 GMT

Strong magnitude 5.7 earthquake at 5 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.

Earthquake details

Date & timeApr 22, 1999 22:19:36 UTC
Local time at epicenter
StatusConfirmed
Magnitude5.7
Depth5.0 km
Epicenter latitude / longitude27.953°S / 26.635°E (Lejweleputswa District Municipality, Orange Free State, South Africa)
Antipode27.953°N / 153.365°W
Shaking intensityStrong shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearby towns and cities10 km (6 mi) WNW of Welkom (pop: 431,900) | Show on map | Quakes nearby
17 km (11 mi) SW of Kutloanong (pop: 95,000) | Show on map | Quakes nearby
22 km (14 mi) S of Allanridge (pop: 31,700) | Show on map | Quakes nearby
28 km (18 mi) NW of Virginia (pop: 122,500) | Show on map | Quakes nearby
29 km (18 mi) ESE of Wesselsbron (pop: 42,600) | Show on map | Quakes nearby
136 km (85 mi) NNE of Bloemfontein (pop: 463,100) | Show on map | Quakes nearby
173 km (107 mi) NNW of Maseru (Lesotho) (pop: 118,400) | Show on map | Quakes nearby
223 km (139 mi) SSW of Soweto (Gauteng) (pop: 1,695,000) | Show on map | Quakes nearby
240 km (149 mi) SW of Johannesburg (Gauteng) (pop: 2,026,500) | Show on map | Quakes nearby
290 km (180 mi) SSW of Pretoria (Gauteng) (pop: 1,619,400) | Show on map | Quakes nearby
Estimated seismic energy released2.2 x 1013 joules (6.22 gigawatt hours, equivalent to 5351 tons of TNT or 0.3 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.
Mag.DepthLocationSource
5.75 kmSouth AfricaUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.
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