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Light mag. 3.5 earthquake - 4.3 km southwest of Boksburg, South Africa, on 2021-07-30 06:34:52 SAST (GMT+02:00)

Light mag. 3.5 earthquake - 4.3 km southwest of Boksburg, South Africa, on 2021-07-30 06:34:52 SAST (GMT+02:00) Light mag. 3.5 earthquake - 4.3 km southwest of Boksburg, South Africa, on 2021-07-30 06:34:52 SAST (GMT+02:00)

Light magnitude 3.5 earthquake at 10 km depth

30 Jul 04:37 UTC: First to report: VolcanoDiscovery after 2 minutes.
30 Jul 04:42: Now using data updates from CGS
30 Jul 04:49: Magnitude recalculated from 3.6 to 3.5.
Update Fri, 30 Jul 2021, 05:12

Earthquake reported about 20 minutes ago near Johannesburg, Gauteng, South Africa

We are receiving unverified early reports of seismic activity in or near Johannesburg, Gauteng, South Africa on 30 Jul 2021 (GMT) at approximately 04:48.
There are no details yet on the magnitude or depth of this earthquake. We expect more accurate data to emerge in the next few minutes. The location and magnitude mentioned are indicative and temporary until the AllQuakes monitoring service receives more exact scientific data from a national or international seismological agency. Check back here shortly and stay safe.

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Earthquake details

Date & timeJul 30, 2021 04:34:52 UTC
Local time at epicenter2021-07-30 06:34:52 SAST (GMT+02:00)
StatusConfirmed
Magnitude3.5
Depth10.0 km
Epicenter latitude / longitude26.238°S / 28.228°E (Ekurhuleni Metropolitan Municipality, Gauteng, South Africa)
Antipode26.238°N / 151.772°W
Shaking intensityWeak shaking
Felt4037 reports
Primary data sourceCGS (Council for Geoscience, South African National Seismograph Network)
Nearby towns and cities4 km (3 mi) SW of Boksburg (pop: 445,200) | Show on map | Quakes nearby
11 km (7 mi) WSW of Benoni (pop: 605,300) | Show on map | Quakes nearby
11 km (7 mi) ENE of Alberton (pop: 121,500) | Show on map | Quakes nearby
13 km (8 mi) SE of Edenvale (pop: 49,300) | Show on map | Quakes nearby
14 km (9 mi) W of Brakpan (pop: 305,700) | Show on map | Quakes nearby
17 km (11 mi) W of Springs (pop: 186,400) | Show on map | Quakes nearby
19 km (12 mi) ESE of Johannesburg (pop: 2,026,500) | Show on map | Quakes nearby
27 km (17 mi) S of Tembisa (pop: 511,700) | Show on map | Quakes nearby
37 km (23 mi) E of Soweto (pop: 1,695,000) | Show on map | Quakes nearby
55 km (34 mi) S of Pretoria (pop: 1,619,400) | Show on map | Quakes nearby
Estimated seismic energy released1.1 x 1010 joules (3.12 megawatt hours, equivalent to 2.68 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
3.510 kmSouth Africa RegionCGS
4.25 km13 Km SE of Alberton, South AfricaUSGS
4.25 kmSOUTH AFRICAEMSC

Seismograms

Seismic station: Lobatse, Botswana (LBTB/GT network) | Distance from quake: 297 km / 184 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. Bandpass filter applied: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (4277)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Alberton, Ekurhuleni Metropolitan Municipality, Gauteng (14.7 km SW of epicenter) [Map] / Light shaking (MMI IV) : Felt like a heavy truck revving it’s engine in the next room. Lots of shaking but no displacement of objects. | 23 users found this interesting.  
  • I felt it,i live in Sunward park 06:34
  • I felt it as well in randburg it shook the walls and windows. So scary
Boksburg (7.2 km NNE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 s : North to South Movement ...it felt like 2 Movements 1 and then another one 2 to 3 seconds | 17 users found this interesting.  
  • I live in Boksburg, SA and felt it.
Tedstoneville germiston south africa (3.3 km W of epicenter) [Map] / Moderate shaking (MMI V) / complex motion difficult to describe / 2-5 s : Everything was shaking dogs are going mad the houses roof started shaking badly some pieces of the roof inside sounded like it was going to fall put | 13 users found this interesting.  
Eden Glen, Ekurhuleni Metropolitan Municipality, Gauteng (15 km N of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 10-15 s : Felt the whole ground shaking as if a huge ship landed on ground or something. All windows rattled quite bad foe about 10 sec | 10 users found this interesting.  
  • I live in Boksburg,South Africa. It felt like a huge bomb exploding! The tremor lasted 3 to 4 seconds
Benoni, Ekurhuleni Metropolitan Municipality, Gauteng (8.7 km NE of epicenter) [Map] / Light shaking (MMI IV) : Shaking that woke me up, nothing falling off walls etc. I thought it was a mine fall that we used to experience in Gauteng. | 9 users found this interesting.  
Florentia / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : I was lying in bed and felt like the bed was moving like a ship. My husband and son where standing and didnt feel it as much | 8 users found this interesting.  
Orange Grove (16.5 km WNW of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s : Vibrating and shaking, my bed and windows where shaking thought someone hit my window with a car or something | 6 users found this interesting.  
Johannesburg (19 km WNW of epicenter) [Map] / Weak shaking (MMI III) : The building I live in was shaking. It was brief but it almost felt like the building was about to collapse | 5 users found this interesting.  
Boksburg, Ekurhuleni Metropolitan Municipality, Gauteng (4.4 km SE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Was still sleeping that time, when I was awaken by the quake. For me it was a quite a big quake. Havent felt something like that for a very long time. Lasted about +/-3-5sec,Sunwardpark, Boksburg | 5 users found this interesting.  
Boksburg, Ekurhuleni Metropolitan Municipality, Gauteng (3.2 km SE of epicenter) [Map] / Moderate shaking (MMI V) / vertical swinging (up and down) / 15-20 s : Single bang like an explosion, felt like an upwards vertical movement of the aerh. With a rolling rumbling tremor, diminishing in intensity | 4 users found this interesting.  
  • Similar experience … single bang/thud … slight sudden vertical movement experience and rolling rumble and tremor
Vosloorus Gauteng (14.3 km S of epicenter) [Map] / Weak shaking (MMI III) / vibration and rolling / 15-20 s : Felt the roof and the house shaking with the sound of almost like very strong thunder | 6 users found this interesting.  
Boksburg, Dawn Park / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : We have a lot of tremors in the area because of the mines, that definitely didn’t feel like a tremor. It was stronger, longer & more intense. | 5 users found this interesting.  
Johannesburg, City of Johannesburg Metropolitan Municipality, Gauteng (19.4 km W of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I was woken up by the vibration of the wake in my apartment building. Most intense I have felt in a while. | 2 users found this interesting.  
Boksburg, Ekurhuleni Metropolitan Municipality, Gauteng (6.6 km NNW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Everything shook from the building to my windows and cupboards, even my bed vibrated. I am on the 1st floor. | 2 users found this interesting.  
Edenvale, Ekurhuleni Metropolitan Municipality, Gauteng (11.6 km WNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : We were om first floor and there was a rattling noise with vibration from ceiling. Thr bed was also vibrating like you are driving on an unpaved road. It happened twice within short time | 2 users found this interesting.  
Brackenhurst, Alberton (15.3 km SW of epicenter) [Map] / Weak shaking (MMI III) : Heard a huge rumble that sounded like an aeroplane but louder. Minor shaking experienced in the house | 2 users found this interesting.  
Johannesburg, City of Johannesburg Metropolitan Municipality, Gauteng (21.3 km W of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 10-15 s : It felt like ripple effect. My fiancee and I live in a double storey house. Our bedroom is upstairs and we felt the the ripple effect, almost like driving in a huge truck and hitting a speed bump. | One user found this interesting.  
Centurion, City of Tshwane Metropolitan Municipality, Gauteng (39.7 km N of epicenter) [Map] / Light shaking (MMI IV) / 1-2 s : I was in my study. The desk shook visibly and our bird went crazy in her cage. My first experience ever, whilst being awake and aware of what was happening. | One user found this interesting.  
Bedford view Johannesburg (13.9 km NW of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s : My bed was moving and objects and windows were shaking. The building felt like it was swaying. This was felt in the ground floor and first floor of the structure | One user found this interesting.  
Edenvale (13.3 km NW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Paintings in my walls were shaking. I was in my bed and felt the vibrations. Sound was quite loud. The sound continued long after the vibrations ended. As if a train was moving away from us. | One user found this interesting.  
Johannesburg (37.1 km NW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating : I woke to hear doors rattling. It being a tremor crossed my mind but I didn't think too much of it until I saw other people had experienced it too. | 3 users found this interesting.  
Alberton / Moderate shaking (MMI V) / rattling, vibrating / 5-10 s : Biggest shake ever I felt in gauteng. | 3 users found this interesting.  
Bruma North / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : It felt more like a vibration and I could hear rattling in the ceiling.. Almost felt like the roof was going to cave in. | One user found this interesting.  
Boksburg, Ekurhuleni Metropolitan Municipality, Gauteng (6.7 km SSE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : The walls, gates and roofs were vibrating with huge sound. It felt it could cause cracks on the walls.  
Boksburg, Ekurhuleni Metropolitan Municipality, Gauteng (1.4 km ENE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : It happened so quick and I was nervous . I was standing inside the house and I could feel the house shaking  
Boksburg, Ekurhuleni Metropolitan Municipality, Gauteng (6.7 km SSE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : The walls, gates and roofs were vibrating with huge sound. It felt it could cause cracks on the walls.  
Eden Glen, Ekurhuleni Metropolitan Municipality, Gauteng (13.7 km N of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging : The entire household was woken up. A deep rumbling vibration could be felt and everything in the house rattled around, but nothing fell or broke. The pets were disturbed for a little while.  
Alberton, Ekurhuleni Metropolitan Municipality, Gauteng (16.2 km SW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s : Initially like an explosion followed with heay horisontal shake and then rambling in a westerly direction.  
Edenvale, Ekurhuleni Metropolitan Municipality, Gauteng (13.4 km NW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / very short : What was that, I asked my husband as we lay in bed. He too felt the tremor as well as hearing a jolting sound.  
Boksburg, Ekurhuleni Metropolitan Municipality, Gauteng (3.5 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating : I thought it might be another blast from illegal mining activity in our Boksburg area but felt that it was rather more intense than those  
  • Felt it in Birch Acres in Kempton Park
Johannesburg, City of Johannesburg Metropolitan Municipality, Gauteng (21.3 km W of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating : I was asleep and I heard a noise and felt shaking at the same time. I thought it was part of my dream and so I shook it off (no pun intended).  
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