Sismo leggero mag. 3.4 - 39 km a nord da Santa Rosa, Contea di Sonoma County, Contea di Kern, Stati Uniti, martedì, 19 ott 2021 21:05 (GMT -7) -

Sismo leggero mag. 3.4 - 39 km a nord da Santa Rosa, Contea di Sonoma County, Contea di Kern, Stati Uniti, martedì, 19 ott 2021 21:05 (GMT -7)

Sismo leggero magnitudine 3.4 at 1 km depth

20 Oct 04:08 UTC: Primo a segnalare: USGS dopo 3 minuti.
Update Wed, 20 Oct 2021, 04:12
Small tremor of magnitude 3.4 just reported 24 miles north of Santa Rosa, California, United States
3.4 quake 19 Oct 9:05 pm (GMT -7)
3.4 quake 19 Oct 9:05 pm (GMT -7)
An earthquake of magnitude 3.4 occurred in the evening on Tuesday, October 19th, 2021, at 9:05 pm local time near Santa Rosa, Sonoma County, California, USA, as reported by the United States Geological Survey.
According to preliminary data, the quake was located at a very shallow depth of 0.7 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 3.4 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 3 miles from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Russian River (pop. 11,700) located 14 miles from the epicenter, Russian River (pop. 11,700) 14 miles away, Clearlake (pop. 15,200) 14 miles away, Cloverdale (pop. 8,800) 14 miles away, Windsor (pop. 27,500) 17 miles away, and Santa Rosa (pop. 175,000) 24 miles away. In Rohnert Park (pop. 42,400, 31 miles away), the quake was probably not felt.

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Earthquake data

Data & ora: 20 Oct 2021 04:05:04 UTC -
Ora locale a epicentro: martedì, 19 ott 2021 21:05 (GMT -7)
Magnitudine: 3.4
Prof.: 1.2 km
Epicentro latitudine / longitudine: 38.78833°N / 122.7615°W (Contea di Sonoma, Contea di Kern, Stati Uniti)
Antipode: 38.788°S / 57.239°E
Vulcano più vicino: Clear Lake (20 km / 12 mi)
Nearby towns and cities:
5 km SO da Cobb (pop: 1,780) --> Vedi sismi vicini
18 km O da Hidden Valley Lake (pop: 5,580) --> Vedi sismi vicini
22 km NNE da Russian River (Sonoma County) (pop: 11,700) --> Vedi sismi vicini
22 km NNE da Russian River (pop: 11,700) --> Vedi sismi vicini
22 km SSO da Clearlake (Lake County) (pop: 15,200) --> Vedi sismi vicini
22 km E da Cloverdale (Sonoma County) (pop: 8,810) --> Vedi sismi vicini
27 km N da Windsor (Sonoma County) (pop: 27,500) --> Vedi sismi vicini
39 km N da Santa Rosa (pop: 175,000) --> Vedi sismi vicini
50 km N da Rohnert Park (pop: 42,400) --> Vedi sismi vicini
112 km ONO da Sacramento (pop: 490,700) --> Vedi sismi vicini
Weather at epicenter at time of quake:
Light Rain 5.6°C (42 F), humidity: 86%, wind: 2 m/s (4 kts) from SE
Fonte dati primaria: USGS (United States Geological Survey)
Stima dell'energia sismica liberata: 7.9 x 109 joules (2.21 MWh, equivalent to 1.9 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.
3.41.2 km1km NNW of The Geysers, CAUSGS

User reports for this quake (4)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Cobb, Lake, California (9.9 km NE of epicenter) [Map] / Light shaking (MMI IV) / vertical swinging (up and down) / 10-15 s
1809 w myrtle st calistoga ca 94515 / Light shaking (MMI IV) / rattling, vibrating / 10-15 s
Novato, CA / not felt
1809 w myrtle st calistoga ca 94515 / Light shaking (MMI IV) / rattling, vibrating / 10-15 s
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