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Sismo debile mag. 2.9 - 30 km a sud da Benton, Contea di Saline County, Arkansas, Stati Uniti, giovedì, 18 nov 2021 12:01 (GMT -6) -

Sismo debile mag. 2.9 - 30 km a sud da Benton, Contea di Saline County, Arkansas, Stati Uniti, giovedì, 18 nov 2021 12:01 (GMT -6) Sismo debile mag. 2.9 - 30 km a sud da Benton, Contea di Saline County, Arkansas, Stati Uniti, giovedì, 18 nov 2021 12:01 (GMT -6)

Sismo debile magnitudine 2.9 a 8.9 km di profondità

18 Nov 18:07 UTC: Primo a segnalare: USGS dopo 7 minuti.
18 Nov 18:38: Profondità ricalcolata da 9.2 a 9.4 km (da 5.7 a 5.8 mi). Posizione dell'epicentro corretta di 1.1 km (0.7 mi) al SO.
18 Nov 18:46: Magnitudine ricalcolata da 2.8 a 2.9. Profondità ricalcolata da 9.4 a 8.9 km (da 5.8 a 5.5 mi).

Dettagli del sismo

Data e ora18 Nov 2021 18:01:01 UTC -
Ora locale all'epicentrogiovedì, 18 nov 2021 12:01 (GMT -6)
Prof.8.9 km
Epicentro latitudine / longitudine34.29083°N / 92.582°W (Contea di Grant, Arkansas, Stati Uniti)
Antipode34.291°S / 87.418°E
Intensità di scuotimentoScuotimento debole
Sentito12 rapporti
Fonte dati primariaUSGS (United States Geological Survey)
Luoghi vicini4 km SO da Prattsville (pop: 306) | Mappa | Sismi nelle vicinanze
17 km O da Sheridan (pop: 4,810) | Mappa | Sismi nelle vicinanze
23 km ESE da Malvern (pop: 10,900) | Mappa | Sismi nelle vicinanze
30 km S da Benton (Saline County) (pop: 34,200) | Mappa | Sismi nelle vicinanze
35 km SSO da Bryant (pop: 20,000) | Mappa | Sismi nelle vicinanze
49 km ESE da Hot Springs (pop: 35,600) | Mappa | Sismi nelle vicinanze
52 km ESE da Hot Springs National Park (pop: 35,200) | Mappa | Sismi nelle vicinanze
54 km O da Pine Bluff (pop: 44,800) | Mappa | Sismi nelle vicinanze
57 km SSO da Littlerock (pop: 198,000) | Mappa | Sismi nelle vicinanze
61 km SSO da North Little Rock (pop: 66,500) | Mappa | Sismi nelle vicinanze
Meteo all'epicentro al momento del sismoOvercast Clouds 13°C (55 F), humidity: 27%, wind: 5 m/s (10 kts) from NNE
Energia sismica rilasciata stimata1.4 x 109 joules (392 kWh, equivalent to 0.338 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.
2.98.9 km3 Km SW of Prattsville, ArkansasUSGS


Seismic station: Mount Ida, Arkansas, USA (MIAR/US network) | Distance from quake: 96 km / 59 mi | Show on map | Station Info
Seismic station Mount Ida, Arkansas, 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. 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 (14)

At magnitude 2.9, this quake might have been felt very close to the epicenter and under calm conditions.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
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Send your own user report!
Bradford Arjansad (179.9 km NNE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : I hear I heard a thunder swell up and then a really loud bolt of lightning strike. Like the lightning strikes get right in my front yard it was so loud. There was no lightning before that or after it.  
Prattsville / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Loud noise and rumbling woke me up from a nap and things in the house were rattling. Went outside to see if there was a car wreck or maybe a tree had fallen. Very loud.  
212 Country Club Rd, Malvern (16.5 km W of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Sounded like explosion near us, house, windows, floors shook and rattled  
Judsonia (139.9 km NE of epicenter) [Map] / not felt
Home at Traskwood, Ar. (Benton, Ar) (17.1 km SSE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating : I was asleep, at noon, I heard a noise, I heard my ceiling fan rocking. This woke me  
near Malvern, Hot Spring, Arkansas (5.1 km NW of epicenter) [Map] / Light shaking (MMI IV) / both vertical and horizontal swinging / 2-5 s : Felt like an explosion next door to us.  
near Seridyana, Grant, Arkansas (17.7 km ESE of epicenter) [Map] / Very weak shaking (MMI II)
Poyen AR / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : I was at my school. And it moved everything thing in the classroom and scared me  
8724 Melett lane Benton, at 72015 / not felt / complex motion difficult to describe / 5-10 s
873 Grant 45, Prattsville, Ar / Very weak shaking (MMI II) / single lateral shake / very short : The warning siren test was sounding, then the house shook and heard a sound like an explosion.  
Prattsville / Weak shaking (MMI III) / very short : It was a quick shake and like a boom, almost like someone hit the building I was in  
Malvern Arkansas / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Small shake  
Prattsville / Very weak shaking (MMI II) / single lateral shake / 2-5 s : Just felt house shake  
Poyen, Arkansas / Light shaking (MMI IV) / rattling, vibrating / 2-5 s

Earlier earthquakes in the same area

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