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Séisme modéré mag. 4.8 - Orange Free State, 13 km à l'est de Orkney, Afrique du Sud, dimanche, 17 juil. 2022 11:19 (GMT +2) -

Séisme modéré mag. 4.8 - Orange Free State, 13 km à l\'est de Orkney, Afrique du Sud, dimanche, 17 juil. 2022 11:19 (GMT +2) Séisme modéré mag. 4.8 - Orange Free State, 13 km à l\'est de Orkney, Afrique du Sud, dimanche, 17 juil. 2022 11:19 (GMT +2)

Séisme modéré magnitude 4.8 à 10 km de profondeur

17 Jul 09:21 UTC: Premier à signaler: VolcanoDiscovery après 2 minutes.
17 Jul 09:25: Maintenant en utilisant une nouvelle source de données: EMSC
17 Jul 09:39: Magnitude recalculée de 3.8 à 4.8. Emplacement de l'épicentre corrigé de 8.3 km (5.2 mi) au SSE.
17 Jul 09:39: Maintenant en utilisant une nouvelle source de données: USGS
Update Sun, 17 Jul 2022, 09:45

Moderate magnitude 4.8 earthquake 13 km southeast of Orkney, South Africa

4.8 quake 17 Jul 11:19 am (GMT +2)
4.8 quake 17 Jul 11:19 am (GMT +2)
A shallow magnitude 4.8 earthquake was reported in the morning near Orkney, Dr Kenneth Kaunda District Municipality, North West, South Africa.
According to the United States Geological Survey, the quake hit on Sunday, July 17th, 2022, at 11:19 am local time at a shallow depth of 10 km. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.8 earthquake as well. A third agency, the citizen-seismograph network of RaspberryShake, reported the same quake at magnitude 4.8.
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 Orkney (pop. 145,800) located 13 km from the epicenter, Stilfontein (pop. 93,100) 18 km away, Klerksdorp (pop. 178,900) 21 km away, and Viljoenskroon (pop. 55,000) 27 km away, the quake should have been felt as light shaking.
Weak shaking might have been felt in Potchefstroom (pop. 123,700) located 44 km from the epicenter, and Bothaville (pop. 71,900) 46 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

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Détails du séisme

Date et l'heure17 Jul 2022 09:19:31 UTC -
Heure locale à l'épicentredimanche, 17 juil. 2022 11:19 (GMT +2)
StatutConfirmé
Magnitude4.8
Profondeur10.0 km
Épicentre latitude / longitude27.006°S / 26.7956°E (Orange Free State, Afrique du Sud)
Antipode sismique27.006°N / 153.204°W
Intensité d'agitationSecousses légères
Senti83 rapports
Source de données principaleUSGS (United States Geological Survey)
Lieux à proximité13 km ESE de Orkney (North-West) (pop: 145,800) | Carte | Séismes à proximité
18 km S de Stilfontein (North-West) (pop: 93,100) | Carte | Séismes à proximité
21 km SE de Klerksdorp (North-West) (pop: 178,900) | Carte | Séismes à proximité
27 km NO de Viljoenskroon (pop: 55,000) | Carte | Séismes à proximité
134 km SO de Soweto (Gauteng) (pop: 1,695,000) | Carte | Séismes à proximité
153 km SO de Johannesburg (Gauteng) (pop: 2,026,500) | Carte | Séismes à proximité
197 km SO de Pretoria (Gauteng) (pop: 1,619,400) | Carte | Séismes à proximité
242 km NNE de Bloemfontein (pop: 463,100) | Carte | Séismes à proximité
Météo à l'épicentre au moment du séismeClear Sky 17.3°C (63 F), humidity: 26%, wind: 1 m/s (3 kts) from NNW
Énergie sismique estimée libérée1 x 1012 joules (278 MWh, équivalent à 239 tonnes de TNT) | about seismic energy
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Données pour le même séisme indiquées par différentes agences

Info : Plus les agences signalent le même séisme et publient des données similaires, plus vous pouvez avoir confiance dans les données. Il faut normalement jusqu'à quelques heures pour que les paramètres sismiques soient calculés avec une précision quasi optimale.
Mag.ProfondeurLieuSource
4.810 km12 Km ESE of Orkney, South AfricaUSGS
4.810 kmSouth AfricaRaspberryShake
4.85 kmSOUTH AFRICAEMSC
4.610 kmSouth AfricaGFZ

Seismograms

Seismic station: Lobatse, Botswana (LBTB/GT network) | Distance from quake: 252 km / 156 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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Témoignages pour ce séisme (83)

Les rapports des utilisateurs estiment l'intensité perçue des secousses du sol en fonction de l' Échelle MMI (Modified Mercalli Intensity Scale).
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roodepoort (147.3 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 1-2 s : Chair and building shook | 4 users found this interesting.  
Coligny, North West / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Heard a rumbling sound like clouds but the sky was clear. Then the windows rattled and we felt a vibration. The dogs started barking it seemed for no reason. Then about 20 mins later we Googled and saw that there was a quake near Orkney. | 3 users found this interesting.  
Ottosdal, North West Province, South Africa (80.7 km WNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating : I started feeling vibrations from fairly deep in the ground around a week, week and a half ago already. It started out as a very feint & weak shake, it grew a bit stronger then it stopped for a couple of days and then it started again 3 days ago, stronger | 2 users found this interesting.  
Radiokop Johannesburg (148.7 km NE of epicenter) [Map] / Weak shaking (MMI III) : Watching TV... Felt a small jolt. Not very intense just one jolt. Small items like the fan and wallet art jolted | 2 users found this interesting.  
Johannesburg (154.9 km NE of epicenter) [Map] / Very weak shaking (MMI II) / 1-2 s : Sat up in bed, and my bed started shaking from left to right, I thought it was me so I moved and it wasn’t the same type of shake because it didn’t move when I tried | 2 users found this interesting.  
Klerksdorp / Weak shaking (MMI III) / vibration and rolling / 20-30 s : Several shakings quite strong. Made me feel worried. Scale of 1 low to 10 very strong I would rate it 6. | 2 users found this interesting.  
Viljoenskroon, skandenawië / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : I heared this roaring sound that followed by a quick light shaking of about 5 to 10 seconds.Objects in the house was making noise during this time and i felt the shaking an roaring while sitting on the coach. | 2 users found this interesting.  
Rustenburg, Bojanala Platinum, North-West (156.8 km NNE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 20-30 s : My coffee in cup had small waves plus a cupboard door that was slightly open tapped on cupboard frame a few times | One user found this interesting.  
Johannesburg (154.9 km NE of epicenter) [Map] / Very weak shaking (MMI II) / 1-2 s : Sat up in bed, and my bed started shaking from left to right, I thought it was me so I moved and it wasn’t the same type of shake because it didn’t move when I tried | One user found this interesting.  
Johannesburg (154.1 km NE of epicenter) [Map] / Very weak shaking (MMI II) : Studying at home, seated, felt a tremor and heard the wall creak. Lasted only a second or two and very weak.  
Centurion, Gauteng (178.5 km NE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Sitting in bed. Felt my bed vibrating, twice. | One user found this interesting.  
klerksdorp (21.5 km NW of epicenter) [Map] / Weak shaking (MMI III) / vibration and rolling / 5-10 s : everyone notice it | One user found this interesting.  
Klerksdorp (20.2 km NNW of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s : Terrifying | One user found this interesting.  
Orkney, Dr Kenneth Kaunda District Municipality, North-West (12.8 km WNW of epicenter) [Map] / Moderate shaking (MMI V) / 1-2 s : Rumble started before everything started shaking | One user found this interesting. (reported through our app)  
flamwood kledk (21.2 km NNW of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 10-15 s : i was at home | One user found this interesting.  
Klerksdorp / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s : If felt the building shifting, heard parts rattling in response; and my body shook as the shockwave reveberated from the ground upwards.  
Meirings park / Light shaking (MMI IV) / rattling, vibrating / 15-20 s : The house was leterally shaking, all the pictutures nd decors on the walls were shaking | One user found this interesting. (reported through our app)  
Klerksdorp / Light shaking (MMI IV) / rattling, vibrating / 15-20 s : Tremble and shaking for about 10 to 20 seconds with a light bump about 3minutes later | One user found this interesting.  
Klerksdorp / Moderate shaking (MMI V) / vibration and rolling / 2-5 s : moderate shaking and loud. Walls, floor, and windows shaking. | One user found this interesting.  
CENTURION / Weak shaking (MMI III) / 2-5 s : Everything just started shaking | One user found this interesting.  
Klerksdorp / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : As the quake uccured my computer crashed and my speakers started making weird noises | One user found this interesting.  
Klerksdorp (23.2 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
near Orkney, Dr Kenneth Kaunda District Municipality, North-West (1.9 km SW of epicenter) [Map] / Very weak shaking (MMI II) / very short
Rustenburg district (126.1 km NNE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating : Light shaking and ratling of windows.  
near Fochville, North-West (83.2 km ENE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating
Mooikloof, Pretoria far east (199.4 km NE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 2-5 s
Klerksdorp (21.1 km NNW of epicenter) [Map] / Moderate shaking (MMI V) : Heavy earthquake  
Bryanston (160.8 km NE of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 1-2 s
Klerksdorp (23.2 km NW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 5-10 s
Stilfontein (33.4 km NE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 15-20 s
Klerksdorp (22.5 km NW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Standing on my porch.  
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Earlier earthquakes in the same area

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