Αδύναμος σεισμός μεγέθους 3.4 - Matanuska-Susitna Parish, 31 km βόρεια από Ανκορέιτζ, Anchorage, Αλάσκα, Ηνωμένες Πολιτείες, Σάββατο, 11 Σεπ 2021 08:20 (GMT -8) -

Αδύναμος σεισμός μεγέθους 3.4 - Matanuska-Susitna Parish, 31 km βόρεια από Ανκορέιτζ, Anchorage, Αλάσκα, Ηνωμένες Πολιτείες, Σάββατο, 11 Σεπ 2021 08:20 (GMT -8)

Αδύναμος σεισμός μεγέθους 3.4 at 37 km depth

11 Sep 16:23 UTC: Πρώτα να αναφέρει: VolcanoDiscovery after 3 minutes.
11 Sep 16:24: Now using data updates from USGS
11 Sep 16:25: Hypocenter depth recalculated from 20.6 to 20.5 km (from 12.8 to 12.7 mi). Epicenter location corrected by 1.3 km (0.8 mi) towards SSE.
11 Sep 16:28: Magnitude recalculated from 3.5 to 3.4. Hypocenter depth recalculated from 20.5 to 37.1 km (from 12.7 to 23 mi). Epicenter location corrected by 4.9 km (3 mi) towards 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

Ημερομηνία & time: 11 Sep 2021 16:20:55 UTC -
Τοπική ώρα στο επίκεντρο: Σάβ, 11 Σεπ 2021 08:20 (GMT -8)
Μέγεθος: 3.4
Βάθος: 37.1 km
Επίκεντρο γεωγραφικό πλάτος / γεωγραφικό μήκος: 61.498°N / 149.9085°W (Matanuska-Susitna, Αλάσκα, Ηνωμένες Πολιτείες)
Antipode: 61.498°S / 30.092°E
Πλησιέστερα ηφαίστειο: Spurr (127 km / 79 mi)
Nearby towns and cities:
4 km (2 mi) ΝΑ of Big Lake (pop: 3,350) --> Δείτε κοντινούς σεισμούς!
15 km (10 mi) ΝΔ of Houston (pop: 2,210) --> Δείτε κοντινούς σεισμούς!
16 km (10 mi) Δ of Knik-Fairview (pop: 14,900) --> Δείτε κοντινούς σεισμούς!
22 km (13 mi) ΝΔ of Meadow Lakes (pop: 7,570) --> Δείτε κοντινούς σεισμούς!
27 km (17 mi) ΒΔ of Eagle River (pop: 24,800) --> Δείτε κοντινούς σεισμούς!
27 km (17 mi) ΒΔ of Eagle River (Anchorage) (pop: 24,800) --> Δείτε κοντινούς σεισμούς!
29 km (18 mi) ΝΑ of Willow Creek (pop: 2,100) --> Δείτε κοντινούς σεισμούς!
31 km (19 mi) Β of Ανκορέιτζ (pop: 298,700) --> Δείτε κοντινούς σεισμούς!
34 km (21 mi) ΝΔ of Lakes (pop: 8,360) --> Δείτε κοντινούς σεισμούς!
44 km (27 mi) ΝΔ of Palmer (pop: 6,790) --> Δείτε κοντινούς σεισμούς!
Weather at epicenter at time of quake:
Scattered Clouds 6°C (43 F), humidity: 98%, wind: 2 m/s (3 kts) from N
Κύρια πηγή δεδομένων: USGS (United States Geological Survey)
Estimated released energy: 7.9 x 109 joules (2.21 megawatt hours, ισοδυναμεί με 1.9 τόνους TNT) | about seismic energy
Διαδραστικός χάρτης
[μικρότερα] [μεγαλύτερα]
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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.ΒάθοςΤοποθεσίαΠηγή
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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