Light mag. 3.5 earthquake - North Pacific Ocean, 21 mi southwest of Fortuna, Humboldt County, California, USA, on Thursday, 15 Apr 2021 9:09 pm (GMT -7) -

Light mag. 3.5 earthquake - North Pacific Ocean, 21 mi southwest of Fortuna, Humboldt County, California, USA, on Thursday, 15 Apr 2021 9:09 pm (GMT -7)

Séisme faible magnitude 3.5 at 20 km depth

16 Apr 04:12 UTC: Premier à signaler: USGS après 2 minutes.
16 Apr 07:10: Profondeur recalculée de 17.6 à 20.2 km (de 10.9 à 12.6 mi). Emplacement de l'épicentre corrigé de 2.7 km (1.7 mi) au O.
Update Fri, 16 Apr 2021, 04:18
Magnitude 3.5 earthquake strikes near Eureka, Humboldt County, California, USA
3.5 quake 15 Apr 9:09 pm (GMT -7)
3.5 quake 15 Apr 9:09 pm (GMT -7)
The United States Geological Survey reported a magnitude 3.5 quake in the United States near Eureka, Humboldt County, California, only 8 minutes ago. The earthquake hit in the evening on Thursday 15 April 2021 at 9:09 pm local time at a shallow depth of 10.9 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 3.5 as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Ferndale (pop. 1,400) located 15 miles from the epicenter, Rio Dell (pop. 3,400) 18 miles away, Fortuna (pop. 12,000) 19 miles away, Humboldt Hill (pop. 3,400) 26 miles away, Pine Hills (pop. 3,100) 27 miles away, and Eureka (pop. 27,000) 31 miles away. In Bayside (pop. 17,100, 36 miles away), Arcata (pop. 17,800, 37 miles away), and McKinleyville (pop. 15,200, 41 miles away), the quake was probably not felt.
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Earthquake data:

Date & time: 16 Apr 2021 04:09:45 UTC -
Local time at epicenter: jeudi, 15 avril 2021 21:09 (GMT -7)
Magnitude: 3.5
Profondeur: 20.2 km
Epicenter latitude / longitude: 40.4035°N / 124.4525°W (Océan Pacifique Nord, Comté de Kern, États-Unis)
Volcan le plus près: Clear Lake (213 km / 132 mi)
Nearby towns and cities:
25 km SO de Ferndale (pop: 1,370) --> Voir les séismes à proximité!
31 km OSO de Rio Dell (pop: 3,390) --> Voir les séismes à proximité!
33 km SO de Fortuna (Humboldt County) (pop: 12,000) --> Voir les séismes à proximité!
51 km SSO de Eureka (Humboldt County) (pop: 27,000) --> Voir les séismes à proximité!
59 km SO de Bayside (Humboldt County) (pop: 17,100) --> Voir les séismes à proximité!
60 km SSO de Arcata (Humboldt County) (pop: 17,800) --> Voir les séismes à proximité!
62 km ONO de Redway (pop: 1,230) --> Voir les séismes à proximité!
67 km SSO de McKinleyville (Humboldt County) (pop: 15,200) --> Voir les séismes à proximité!
77 km SSO de Westhaven-Moonstone (pop: 1,210) --> Voir les séismes à proximité!
175 km O de Redding (pop: 91,600) --> Voir les séismes à proximité!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.1 x 1010 joules (3.12 megawatt hours, equivalent to 2.68 tons of TNT) Plus d'infos
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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.ProfondeurLieuSource
3.520 km14km NW of Petrolia, CA, USAUSGS
2.910 kmOFFSHORE NORTHERN CALIFORNIA, USAEMSC

User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Ferndale / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s
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