Light mag. 3.3 earthquake - Lake County, 22 mi north of Santa Rosa, Sonoma County, California, USA, on Sunday, 25 Apr 2021 9:05 pm (GMT -7) -
Séisme faible magnitude 3.3 at 0 km depth
26 Apr 04:09 UTC: Premier à signaler: EMSC après 3 minutes.
26 Apr 04:09: Maintenant en utilisant une nouvelle source de données: USGS
Update Mon, 26 Apr 2021, 04:15Small magnitude 3.3 earthquake 22 miles north of Santa Rosa, California, United States
3.3 quake 25 Apr 9:05 pm (GMT -7)
A very shallow magnitude 3.3 earthquake was reported in the evening near Santa Rosa, Sonoma County, California, USA.
According to the United States Geological Survey, the quake hit on Sunday 25 April 2021 at 9:05 pm local time at a very shallow depth of 0.2 miles. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. 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 3.3 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 Middletown (pop. 1,300) located 5 miles from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Hidden Valley Lake (pop. 5,600) located 8 miles from the epicenter, Healdsburg (pop. 11,700) 13 miles away, Russian River (pop. 11,700) 13 miles away, Clearlake (pop. 15,200) 15 miles away, Windsor (pop. 27,500) 16 miles away, and Santa Rosa (pop. 175,000) 22 miles away. In Rohnert Park (pop. 42,400, 29 miles away), the quake was probably not felt.
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Date & time: 26 Apr 2021 04:05:56 UTC -
Local time at epicenter:
dimanche, 25 avril 2021 21:05 (GMT -7)
Profondeur: 0.4 km
Epicenter latitude / longitude: 38.75367°N / 122.699°W
(Comté de Lake
, Comté de Kern
Volcan le plus près: Clear Lake
(25 km / 16 mi)
Nearby towns and cities:7 km O de Middletown
(pop: 1,320) --> Voir les séismes à proximité!22 km NE de Healdsburg (Sonoma County)
(pop: 11,700) --> Voir les séismes à proximité!22 km NE de Russian River
(pop: 11,700) --> Voir les séismes à proximité!24 km SSO de Clearlake (Lake County)
(pop: 15,200) --> Voir les séismes à proximité!25 km NNE de Windsor (Sonoma County)
(pop: 27,500) --> Voir les séismes à proximité!35 km N de Santa Rosa
(pop: 175,000) --> Voir les séismes à proximité!46 km N de Rohnert Park
(pop: 42,400) --> Voir les séismes à proximité!62 km NO de Napa
(pop: 80,400) --> Voir les séismes à proximité!106 km O de Sacramento
(pop: 490,700) --> Voir les séismes à proximité!112 km NNO de San Francisco
(pop: 864,800) --> Voir les séismes à proximité!
Primary data source: USGS
(United States Geological Survey)
Estimated released energy: 5.6 x 109
joules (1.56 megawatt hours, equivalent to 1.34 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.
|3.3||0.4 km||2km SSW of Anderson Springs, CA, USA||USGS|
|2.7||5 km||NORTHERN CALIFORNIA, USA||EMSC|
User reports for this quake (8)
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Piedmont / Light shaking (MMI IV) / 5-10 s : Felt larger than a 3.3 | One user found this interesting.
Berkeley / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : I felt it | One user found this interesting.
San Francisco / Very weak shaking (MMI II) / very short : My bed shook very briefly. I’m on the 3rd floor apartment on a steep hill | One user found this interesting.
Loch Lomond (11.6 km N of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
San Francisco / Very weak shaking (MMI II) / very short : My bed shook very briefly. I’m on the 3rd floor apartment on a steep hill
San Francisco / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s
107.8 km SSE of epicenter [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s
Van nuys / Very weak shaking (MMI II) / very short
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