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Séisme modéré mag. 3.9 - 44 km au nord de Ukiah, Comté de Mendocino County, Californie, États-Unis, 23 Apr 4:18 am (GMT -7)

Séisme modéré mag. 3.9 - 44 km au nord de Ukiah, Comté de Mendocino County, Californie, États-Unis, 23 Apr 4:18 am (GMT -7) Séisme modéré mag. 3.9 - 44 km au nord de Ukiah, Comté de Mendocino County, Californie, États-Unis, 23 Apr 4:18 am (GMT -7)

Séisme modéré magnitude 3.9 à 7.4 km de profondeur

23 Apr 11:22 UTC: Premier à signaler: USGS après 4 minutes.
23 Apr 11:24: Magnitude recalculée de 3.7 à 4.0.
23 Apr 14:02: Magnitude recalculée de 4.0 à 3.9.
23 Apr 18:00: Profondeur recalculée de 6.6 à 7.4 km (de 4.1 à 4.6 mi).
Update Fri, 23 Apr 2021, 11:27

Moderate magnitude 4.0 quake hits 28 miles northeast of Ukiah, California, United States early morning

4.0 quake 23 Apr 4:18 am (GMT -7)
4.0 quake 23 Apr 4:18 am (GMT -7)
The United States Geological Survey reported a magnitude 4.0 quake in the United States near Ukiah, Mendocino County, California, only 8 minutes ago. The earthquake hit early morning on Friday 23 April 2021 at 4:18 am local time at a very shallow depth of 4.1 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.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.0 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 Potter Valley (pop. 650) located 15 miles from the epicenter, Willits (pop. 4,900) 19 miles away, Brooktrails (pop. 3,200) 19 miles away, and Redwood Valley (pop. 1,700) 20 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Covelo (pop. 1,300) located 22 miles from the epicenter, Ukiah (pop. 15,900) 28 miles away, Nice (pop. 2,700) 30 miles away, and Clearlake (pop. 15,200) 45 miles away.

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Détails du séisme

Date et l'heure23 Apr 2021 11:18:40 UTC
Heure locale à l'épicentre23 Apr 4:18 am (GMT -7)
StatutConfirmé
Magnitude3.9
Profondeur7.4 km
Épicentre latitude / longitude39.52567°N / 123.0365°W (Comté de Mendocino, Californie, États-Unis)
Antipode39.526°S / 56.964°E
Intensité d'agitationSecousses faibles
Senti6 rapports
Source de données principaleUSGS (United States Geological Survey)
Volcan le plus prèsClear Lake (66 km / 41 mi)
Lieux à proximité24 km NNE de Potter Valley (pop: 646) | Carte | Séismes à proximité
30 km ENE de Little Lake (pop: 4,860) | Carte | Séismes à proximité
32 km NNE de Redwood Valley (pop: 1,730) | Carte | Séismes à proximité
35 km SSE de Covelo (pop: 1,260) | Carte | Séismes à proximité
42 km ESE de Laytonville (pop: 1,230) | Carte | Séismes à proximité
44 km NNE de Ukiah (pop: 15,900) | Carte | Séismes à proximité
50 km NNO de North Lakeport (pop: 3,310) | Carte | Séismes à proximité
67 km E de Fort Bragg (Mendocino County) (pop: 7,290) | Carte | Séismes à proximité
72 km NNO de Clearlake (Lake County) (pop: 15,200) | Carte | Séismes à proximité
170 km NO de Sacramento (pop: 490,700) | Carte | Séismes à proximité
Météo à l'épicentre au moment du séismeBroken Clouds 5.9°C (43 F), humidity: 81%, wind: 2 m/s (3 kts) from NE
Énergie sismique estimée libérée4.5 x 1010 joules (12.4 MWh, équivalent à 10.7 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
3.97.4 km15km NNW of Lake Pillsbury, CA, USAUSGS
3.45 kmNORTHERN CALIFORNIA, USAEMSC

Seismograms

Seismic station: Marconi Conference Center, Marshall, CA, USA (MCCM/BK network) | Distance from quake: 154 km / 96 mi | Show on map | Station Info
Seismic station Marconi Conference Center, Marshall, CA, 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 (6)

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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San Jose, California 95148 / Light shaking (MMI IV) / single lateral shake / 2-5 s : Woke me up from sleep, a bag of items on top of another bag of items fell over. Then the wall behind me seemed to be jolted once northeasterly, creaked, rumbled and stopped. From jolt to stop was 2 seconds tops.  
Orange, CA / Light shaking (MMI IV) / single lateral shake / 5-10 s
Nas Lemoore (455.8 km SE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 5-10 s
San Jose / Very weak shaking (MMI II) / single vertical bump / 1-2 s
5726 Ridgewood Road Willits, CA (27.6 km SW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : Woke up to house shaking.  
93041 / Light shaking (MMI IV) / rattling, vibrating / 2-5 s

Earlier earthquakes in the same area

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