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Séisme faible mag. 4.5 - 19 km au sud-ouest de Susitna North, Arrondissement de Matanuska-Susitna, Alaska, États-Unis, jeudi, 26 nov. 2020 12:12 (GMT -9)

Séisme faible mag. 4.5 - 19 km au sud-ouest de Susitna North, Arrondissement de Matanuska-Susitna, Alaska, États-Unis, jeudi, 26 nov. 2020 12:12 (GMT -9) Séisme faible mag. 4.5 - 19 km au sud-ouest de Susitna North, Arrondissement de Matanuska-Susitna, Alaska, États-Unis, jeudi, 26 nov. 2020 12:12 (GMT -9)

Séisme faible magnitude 4.5 à 40 km de profondeur

26 Nov 21:16 UTC: Premier à signaler: USGS après 4 minutes.
26 Nov 21:20: Profondeur recalculée de 33.5 à 33.7 km (de 21 à 21 mi).
26 Nov 21:25: Profondeur recalculée de 33.7 à 40.3 km (de 21 à 25 mi).
26 Nov 21:31: Profondeur recalculée de 40.3 à 39.7 km (de 25 à 25 mi). Emplacement de l'épicentre corrigé de 3.4 km (2.1 mi) au NNW.
Update Thu, 26 Nov 2020, 21:18

Light magnitude 4.5 quake hits 53 miles north of Anchorage, Alaska around noon

4.5 quake 26 Nov 12:12 pm (GMT -9)
4.5 quake 26 Nov 12:12 pm (GMT -9)
An earthquake of magnitude 4.5 occurred only 6 minutes ago 53 miles north of Anchorage, Alaska, the United States Geological Survey (USGS) reported.
The quake hit at a moderately shallow depth of 21 miles beneath the epicenter near Susitna North around noon on Thursday 26 November 2020 at 12.12 pm local time. 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.
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 Susitna North (pop. 1,300) located 13 miles from the epicenter, Willow (pop. 2,100) 17 miles away, Talkeetna (pop. 900) 24 miles away, Trapper Creek (pop. 500) 24 miles away, Meadow Lakes (pop. 2,200) 25 miles away, Elmendorf Air Force Base (pop. 24,800) 48 miles away, Eagle River (pop. 24,800) 48 miles away, and Anchorage (pop. 298,700) 53 miles 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'heure26 Nov 2020 21:12:10 UTC
Heure locale à l'épicentrejeudi, 26 nov. 2020 12:12 (GMT -9)
StatutConfirmé
Magnitude4.5
Profondeur39.7 km
Épicentre latitude / longitude62.0119°N / 150.0177°W (Arrondissement de Matanuska-Susitna, Alaska, États-Unis)
Antipode sismique62.012°S / 29.982°E
Intensité d'agitationSecousses légères
Senti8 rapports
Source de données principaleUSGS (United States Geological Survey)
Volcan le plus prèsHayes (135 km / 84 mi)
Lieux à proximité19 km SSO de Susitna North (pop: 1,260) | Carte | Séismes à proximité
29 km N de Willow Creek (pop: 2,100) | Carte | Séismes à proximité
44 km NNO de Houston (pop: 2,210) | Carte | Séismes à proximité
48 km NNO de Meadow Lakes (pop: 7,570) | Carte | Séismes à proximité
51 km NO de Fishhook (pop: 4,680) | Carte | Séismes à proximité
58 km NO de Lakes (pop: 8,360) | Carte | Séismes à proximité
60 km NNO de Knik-Fairview (pop: 14,900) | Carte | Séismes à proximité
80 km NNO de Eagle River (pop: 24,800) | Carte | Séismes à proximité
80 km NNO de Eagle River (Anchorage) (pop: 24,800) | Carte | Séismes à proximité
89 km N de Alaska City (pop: 298,700) | Carte | Séismes à proximité
Météo à l'épicentre au moment du séismeOvercast Clouds -2.8°C (27 F), humidity: 90%, wind: 2 m/s (3 kts) from SSE
Énergie sismique estimée libérée3.5 x 1011 joules (98.6 MWh, équivalent à 84.8 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
4.540 km18 Km SSW of Susitna North, Alaska, USAUSGS
4.854 kmCentral Alaska, USAGFZ

Seismograms

Seismic station: Chulitna, AK, USA (CUT/AK network) | Distance from quake: 46 km / 28 mi | Show on map | Station Info
Seismic station Chulitna, AK, 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: 0.2-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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Témoignages pour ce séisme (8)

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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near Susitna North, Matanuska-Susitna, Alaska (6.6 km NNW of epicenter) [Map] / Light shaking (MMI IV) / 5-10 s : Very light shaking, increasing to like a wiggle with a little jerk. Definitely felt, and heard creaking. | One user found this interesting.  
Anchorage / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s : Was sitting on the bed on the 4th floor of my hotel room | One user found this interesting.  
near Alaska City, Anchorage (99.9 km S of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Lakes, Matanuska-Susitna, Alaska (60.9 km SE of epicenter) [Map] / Light shaking (MMI IV)
BIG LAKE (57 km S of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Tanaina, Alaska (50.2 km SE of epicenter) [Map] / Light shaking (MMI IV)
Girdwood, Anchorage, Alaska (125.6 km SSE of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Talkeetna / Light shaking (MMI IV)

Earlier earthquakes in the same area

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