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Séisme faible mag. 3.1 - 64 km au nord-ouest de Montgomery, Alabama, États-Unis, mercredi, 22 déc. 2021 00:20 (GMT -6) -

Séisme faible mag. 3.1 - 64 km au nord-ouest de Montgomery, Alabama, États-Unis, mercredi, 22 déc. 2021 00:20 (GMT -6) Séisme faible mag. 3.1 - 64 km au nord-ouest de Montgomery, Alabama, États-Unis, mercredi, 22 déc. 2021 00:20 (GMT -6)

Séisme faible magnitude 3.1 à 0 km de profondeur

22 Dec 06:24 UTC: Premier à signaler: VolcanoDiscovery après 4 minutes.
22 Dec 06:36: Maintenant en utilisant une nouvelle source de données: USGS
22 Dec 07:00: Magnitude recalculée de 3.3 à 3.1. Profondeur recalculée de 5.0 à 8.8 km (de 3.1 à 5.5 mi). Emplacement de l'épicentre corrigé de 9.3 km (5.8 mi) au WSW.
22 Dec 14:52: Profondeur recalculée de 8.8 à 0.0 km (de 5.5 à 0 mi). Emplacement de l'épicentre corrigé de 6 km (3.7 mi) au NNE.
Update Wed, 22 Dec 2021, 06:42

Magnitude 3.3 earthquake strikes near Montgomery, Montgomery County, Alabama, USA

3.3 quake 22 Dec 12:20 am (GMT -6)
3.3 quake 22 Dec 12:20 am (GMT -6)
The United States Geological Survey reported a magnitude 3.3 quake in the United States near Montgomery, Montgomery County, Alabama, only 21 minutes ago. The earthquake hit after midnight on Wednesday, December 22nd, 2021, at 12:20 am local time at a very shallow depth of 3.1 miles. 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 3.3 earthquake as well.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Clanton (pop. 8,800) located 6 miles from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Bristol (pop. 2,600) located 14 miles from the epicenter, Calera (pop. 13,200) 23 miles away, and Prattville (pop. 35,400) 25 miles away. In Millbrook (pop. 15,300, 28 miles away), Selma (pop. 19,500, 31 miles away), Alabaster (pop. 32,700, 34 miles away), Montgomery (pop. 200,600, 36 miles away), Shelby Courthouse (pop. 22,900, 36 miles away), and Hoover (pop. 84,800, 45 miles away), the quake was probably not felt.

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Détails du séisme

Date et l'heure22 Dec 2021 06:20:48 UTC -
Heure locale à l'épicentremercredi, 22 déc. 2021 00:20 (GMT -6)
StatutConfirmé
Magnitude3.1
Profondeur0.0 km
Épicentre latitude / longitude32.78433°N / 86.7655°W (Comté de Chilton, Alabama, États-Unis)
Antipode32.784°S / 93.235°E
Intensité d'agitationSecousses faibles
Senti41 rapports
Source de données principaleUSGS (United States Geological Survey)
Lieux à proximité10 km E de Maplesville (pop: 704) | Carte | Séismes à proximité
14 km OSO de Clanton (pop: 8,840) | Carte | Séismes à proximité
20 km S de Bristol (pop: 2,620) | Carte | Séismes à proximité
35 km S de Calera (pop: 13,200) | Carte | Séismes à proximité
46 km NO de Prattville (pop: 35,400) | Carte | Séismes à proximité
48 km NNE de Selma (pop: 19,500) | Carte | Séismes à proximité
51 km S de Alabaster (pop: 32,700) | Carte | Séismes à proximité
64 km NO de Montgomery (pop: 200,600) | Carte | Séismes à proximité
69 km S de Hoover (pop: 84,800) | Carte | Séismes à proximité
89 km ESE de Tuscaloosa (pop: 98,300) | Carte | Séismes à proximité
Météo à l'épicentre au moment du séismeClear Sky 4°C (39 F), humidity: 95%, wind: 2 m/s (5 kts) from NW
Énergie sismique estimée libérée2.8 x 109 joules (783 kWh, équivalent à 0.674 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
3.10 km10 Km SW of Clanton, AlabamaUSGS
3.19 kmALABAMAEMSC
3.10 kmAlabamaRaspberryShake

Seismograms

Seismic station: Lakeview Retreat, Alabama, USA (LRAL/US network) | Distance from quake: 36 km / 22 mi | Show on map | Station Info
Seismic station Lakeview Retreat, Alabama, USA: 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 (49)

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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Maplesville (10.9 km WSW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : Wide awake working on my website,sitting on my bed, (Shed to house conversion on the main floor). House shook and rattled the windows. I thought it was thunder at first, or maybe a BIG 18 wheeler was going by, but I live on a dead end dirt road with 2 hou | 2 users found this interesting.  
Maplesville, Alabama / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : We heard a very loud rumble & my house shook. Audibly heard my windows rattle. Wasn't for very long but was long enough to startle us to go look outside thinking something close blew up or something. | 2 users found this interesting.  
Plantersville (18.5 km SW of epicenter) [Map] / Weak shaking (MMI III) : Laying on couch with all sounds and power off and heard and dust and dull noise with a small vibrating feeling | One user found this interesting.  
Maplesville, AL / Light shaking (MMI IV) / complex motion difficult to describe / 10-15 s : A huge movement | 3 users found this interesting.  
Clanton (16.5 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I was asleep in bed and felt my bed shaking and it felt like a long thunder | 2 users found this interesting.  
Jones AL (29.8 km SSW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / very short : Just layed down in bed felt the bed move side to side East to West motion | 2 users found this interesting.  
Deatsville Al. 36022 / not felt : All the dogs in the neighborhood were barking like crazy at that time. I was outside with mine. A friend in Clanton texted me about the quake, I realized that was the time I had been outside. She did not feel it, but said it was on FB. | One user found this interesting.  
Clanton / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I was sitting in my garage when all of a sudden the doors started moving and I heard what sounded like a huge thunder for about 5-10 sec. It was very very scary! | One user found this interesting.  
Florence al / Light shaking (MMI IV) : I was in bed, trying to wind down to go to sleep. Felt my bed moving at about 12:30 am. I have high blood pressure so I first thought maybe my pressure was up. But I felt certain it was really my bed moving. So I flip over, turn the light on and ck for a | One user found this interesting.  
Maplesville Alabama / Light shaking (MMI IV) / vibration and rolling / 2-5 s : You could hear and feel something moving through the ground like a bomb had been dropped far enough away not to cause damage to where we are but the sudden rush of vibration and rolling as a roaring sound came through quickly. We had no clue what it was b | One user found this interesting.  
Deatsville Al. 36022 / not felt : All the dogs in the neighborhood were barking like crazy at that time. I was outside with mine. A friend in Clanton texted me about the quake, I realized that was the time I had been outside. She did not feel it, but said it was on FB. | One user found this interesting.  
Lawley (19 km WNW of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s : Felt like I was dizzy and swinging sideways. Sitting on the sofa. It felt like two short shakes or either there was a lull in the shake. 2-7 seconds and a rumble. Made me feel odd.  
Thorsby, Alabama (16.4 km NNE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I was on Facebook. I thought maybe we were having a strong storm that was shaking the house. My children came up from downstairs and were asking if I felt it. Thought then that maybe there had been a train wreck because I have felt that too but apparently  
Maplesville, Al / Light shaking (MMI IV) / rattling, vibrating / 20-30 s : Loud rumbling sound with shaking | 2 users found this interesting.  
Clanton Alabama (610.7 km S of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / very short : Lightshaking and loud | One user found this interesting.  
Clanton (16.5 km NE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I was asleep in bed and felt my bed shaking and it felt like a long thunder | One user found this interesting.  
Chilton County Alabama (15.3 km NNE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : In bed sleeping g it woke me | One user found this interesting.  
Billingsley Alabama / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 s : Very quick, shook my whole house. I was sitting on the couch watching a show and all of a sudden everything started to shake like a semi truck passing by on the interstate or something.  
Thorsby, al / not felt : I heard it rumbling and windows shook but I didn’t feel it but heard it. Woke me up | One user found this interesting.  
Maplesville, AL / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Sounded like a rolling Thunder, dishes in the cabinets rattled, house shook. | One user found this interesting.  
Helena, AL / Very weak shaking (MMI II) / very short : It woke me up but not my partner. | One user found this interesting.  
At home in bed (16.5 km NE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 1-2 s : Rumble and quick shake  
Wetumpka, Elmore, Alabama (52.7 km ESE of epicenter) [Map] / Very weak shaking (MMI II) / very short
Clanton, Alabama (15.2 km ENE of epicenter) [Map] / not felt
Wetumpka, AL (58.4 km ESE of epicenter) [Map] / not felt
Jemison Alabama (18.6 km N of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 15-20 s
35045 (16.6 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s : Very unused boom and rolling Very load long lasting like thunder that never quit  
Billingsley. AL (10.5 km SSE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 30-60 s : Woke up from sleep  
Clanton (15.7 km NE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : Was awakened by ground shaking, house shaking.  
Clanton, AL (27.4 km SE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s
near Bristol, Chilton, Alabama (10.3 km W of epicenter) [Map] / Weak shaking (MMI III) / very short
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Earlier earthquakes in the same area

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