Terremoto moderato mag. 3.8 - 43 km a nord da Santa Rosa, Contea di Sonoma County, Contea di Kern, Stati Uniti, giovedí, 25 febbraio 2021 -

Terremoto moderato mag. 3.8 - 43 km a nord da Santa Rosa, Contea di Sonoma County, Contea di Kern, Stati Uniti, giovedí, 25 febbraio 2021

Terremoto moderato magnitudine 3.8 at 3 km depth

25 Feb 19:34 UTC: Primo a segnalare: USGS dopo 4 minuti.
25 Feb 20:42: Magnitudine ricalcolata da 3.5 a 3.3. Profondità ricalcolata da 1.9 a 2.6 km (da 1.2 a 1.6 mi).
26 Feb 16:34: Magnitudine ricalcolata da 3.3 a 3.8.
Update Thu, 25 Feb 2021, 19:39
Magnitude 3.5 earthquake strikes near Santa Rosa, Sonoma County, California, USA
3.5 quake 25 Feb 11:30 am (GMT -8)
3.5 quake 25 Feb 11:30 am (GMT -8)
The United States Geological Survey reported a magnitude 3.5 quake in the United States near Santa Rosa, Sonoma County, California, only 9 minutes ago. The earthquake hit in the morning on Thursday 25 February 2021 at 11:30 am local time at a very shallow depth of 1.2 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.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.5 earthquake 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 Cobb (pop. 1,800) 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 Cloverdale (pop. 8,800) located 11 miles from the epicenter, Clearlake (pop. 15,200) 14 miles away, Windsor (pop. 27,500) 19 miles away, Santa Rosa (pop. 175,000) 27 miles away, Ukiah (pop. 15,900) 31 miles away, and Rohnert Park (pop. 42,400) 34 miles away. In Petaluma (pop. 60,400, 42 miles away), and Napa (pop. 80,400, 46 miles away), the quake was probably not felt.
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Earthquake data:

Data & ora: 25 Feb 2021 19:30:19 UTC -
Ora locale a epicentro: Thursday, 25 Feb 2021 11:30 (GMT -8)
Magnitudine: 3.8
Profondità: 2.6 km
Epicentro latitudine / longitudine: 38.81783°N / 122.82067°W (Contea di Sonoma, Contea di Kern, Stati Uniti)
Vulcano più vicino: Clear Lake (17 km / 11 mi)
Nearby towns and cities:
8 km O da Cobb (pop: 1,780) --> Vedi sismi vicini
17 km E da Cloverdale (Sonoma County) (pop: 8,810) --> Vedi sismi vicini
23 km SO da Clearlake (Lake County) (pop: 15,200) --> Vedi sismi vicini
23 km N da Healdsburg (Sonoma County) (pop: 11,700) --> Vedi sismi vicini
23 km N da Russian River (pop: 11,700) --> Vedi sismi vicini
30 km N da Windsor (Sonoma County) (pop: 27,500) --> Vedi sismi vicini
43 km NNO da Santa Rosa (pop: 175,000) --> Vedi sismi vicini
50 km SE da Ukiah (pop: 15,900) --> Vedi sismi vicini
54 km NNO da Rohnert Park (pop: 42,400) --> Vedi sismi vicini
118 km ONO da Sacramento (pop: 490,700) --> Vedi sismi vicini
Weather at epicenter at time of quake:
Overcast Clouds 15.9°C (61 F), humidity: 28%, wind: 2 m/s (4 kts) from NW
Fonte dati primaria: USGS (United States Geological Survey)
Stima dell'energia sismica liberata: 3.2 x 1010 joules (8.78 megawatt hours, equivalent to 7.56 tons of TNT) More info
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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.
MagnitudineProfonditàUbicazioneFonte
3.82.6 km7km NW of The Geysers, CA, USAUSGS
3.33 kmNORTHERN CALIFORNIA, USAEMSC

User reports for this quake (6)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Calistoga, CA / Weak shaking (MMI III) : Quick rattle | 2 users found this interesting.  
21.9 km SSW of epicenter [Map] / Weak shaking (MMI III)
Healdsburg (22.1 km S of epicenter) [Map] / Weak shaking (MMI III) / single vertical bump / 1-2 s
22.1 km S of epicenter [Map] / Very weak shaking (MMI II) / single lateral shake / very short : Felt more like a roll with a vertical bump followed by a very short shake (reported through our app)  
Pacifica, CA / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : Felt it and my ceiling fan chandelier was swaying  
Town of Sebastopol California just outside of epic / not felt : No ground motion noticed downtown  
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