Sismo debile mag. 3.4 - Borough di Matanuska-Susitna Parish, 31 km a nord da Alaska City, Anchorage, Alaska, Stati Uniti, sabato, 11 set 2021 08:20 (GMT -8) -

Sismo debile mag. 3.4 - Borough di Matanuska-Susitna Parish, 31 km a nord da Alaska City, Anchorage, Alaska, Stati Uniti, sabato, 11 set 2021 08:20 (GMT -8)

Sismo debile magnitudine 3.4 at 37 km depth

11 Sep 16:23 UTC: Primo a segnalare: VolcanoDiscovery dopo 3 minuti.
11 Sep 16:24: Ora utilizzando nuova fonte di dati: USGS
11 Sep 16:25: Profondità ricalcolata da 20.6 a 20.5 km (da 12.8 a 12.7 mi). Posizione dell'epicentro corretta di 1.3 km (0.8 mi) al SSE.
11 Sep 16:28: Magnitudine ricalcolata da 3.5 a 3.4. Profondità ricalcolata da 20.5 a 37.1 km (da 12.7 a 23 mi). Posizione dell'epicentro corretta di 4.9 km (3 mi) al ENE.
Update Sat, 11 Sep 2021, 16:33
Magnitude 3.4 earthquake strikes near Alaska City, Anchorage, Alaska, USA
3.4 quake 11 Sep 8:20 am (GMT -8)
3.4 quake 11 Sep 8:20 am (GMT -8)
Just 12 minutes ago, a 3.4-magnitude earthquake struck near Alaska City, Anchorage, Alaska, USA. The tremor was recorded in the morning on Saturday, September 11th, 2021, at 8:20 am local time, at a moderately shallow depth of 23 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.4 earthquake as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Big Lake (pop. 3,400) located 2 miles from the epicenter, Knik-Fairview (pop. 14,900) 10 miles away, Meadow Lakes (pop. 7,600) 13 miles away, Wasilla (pop. 9,300) 16 miles away, Eagle River (pop. 24,800) 17 miles away, Eagle River (pop. 24,800) 17 miles away, and Tanaina (pop. 8,200) 18 miles away. In Alaska City (pop. 298,700, 19 miles away), and Lakes (pop. 8,400, 21 miles away), the quake was probably not felt.

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Earthquake data

Data & ora: 11 Sep 2021 16:20:55 UTC -
Ora locale a epicentro: sabato, 11 set 2021 08:20 (GMT -8)
Magnitudine: 3.4
Prof.: 37.1 km
Epicentro latitudine / longitudine: 61.498°N / 149.9085°W (Borough di Matanuska-Susitna, Alaska, Stati Uniti)
Antipode: 61.498°S / 30.092°E
Vulcano più vicino: Spurr (127 km / 79 mi)
Nearby towns and cities:
4 km SE da Big Lake (pop: 3,350) --> Vedi sismi vicini
15 km SSO da Houston (pop: 2,210) --> Vedi sismi vicini
16 km O da Knik-Fairview (pop: 14,900) --> Vedi sismi vicini
22 km SO da Meadow Lakes (pop: 7,570) --> Vedi sismi vicini
27 km NO da Eagle River (pop: 24,800) --> Vedi sismi vicini
27 km NO da Eagle River (Anchorage) (pop: 24,800) --> Vedi sismi vicini
29 km SSE da Willow Creek (pop: 2,100) --> Vedi sismi vicini
31 km N da Alaska City (pop: 298,700) --> Vedi sismi vicini
34 km OSO da Lakes (pop: 8,360) --> Vedi sismi vicini
44 km OSO da Palmer (pop: 6,790) --> Vedi sismi vicini
Weather at epicenter at time of quake:
Scattered Clouds 6°C (43 F), humidity: 98%, wind: 2 m/s (3 kts) from N
Fonte dati primaria: USGS (United States Geological Survey)
Stima dell'energia sismica liberata: 7.9 x 109 joules (2.21 MWh, equivalent to 1.9 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.Prof.UbicazioneFonte
3.437 km3 Km SE of Big Lake, AlaskaUSGS
3.648 kmSOUTHERN ALASKAEMSC

User reports for this quake (5)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Big Lake, Matanuska-Susitna, Alaska (7.8 km NE of epicenter) [Map] / Weak shaking (MMI III) / complex rolling (tilting in multiple directions) / 1-2 s : sitting on couch | One user found this interesting. (reported through our app)  
Palmer (43.5 km ENE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : Like a vehicle ran into the house. | One user found this interesting. (reported through our app)  
Wasilla, AK / Very weak shaking (MMI II) / simple rolling (tilting sideways along one direction) / 2-5 s : In Wasilla. Was on the phone and said, “earthquake,” but my dogs did not come running. Felt it come up behind me from the couch and roll through. My friend on the phone in Anchorage did not feel it. And again, my dogs didn’t even come running.  
Wasilla / Light shaking (MMI IV) / rattling, vibrating / 2-5 s (reported through our app)
Wasilla, ak / Very weak shaking (MMI II) / very short (reported through our app)
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