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Ukiah ca / Light shaking (MMI IV) / rattling, vibrating / very short
Moderate mag. 3.8 earthquake - 24 mi north of Santa Rosa, Sonoma County, California, USA, on Thursday, Mar 3, 2022 at 3:39 am (GMT -8) -
Moderate magnitude 3.8 earthquake at 0 km depth
3 Mar 11:43 UTC: First to report: USGS after 4 minutes.
3 Mar 11:45: Magnitude recalculated from 3.5 to 3.9.
3 Mar 15:32: Magnitude recalculated from 3.9 to 3.8.
3 Mar 19:04: Hypocenter depth recalculated from 0.6 to 0.4 km (from 0.4 to 0.2 mi).
3 Mar 11:45: Magnitude recalculated from 3.5 to 3.9.
3 Mar 15:32: Magnitude recalculated from 3.9 to 3.8.
3 Mar 19:04: Hypocenter depth recalculated from 0.6 to 0.4 km (from 0.4 to 0.2 mi).
Update Thu, 3 Mar 2022, 11:51
Small 3.9 quake hits near Santa Rosa, Sonoma County, California, USA3.9 quake 3 Mar 3:39 am (GMT -8)
A very shallow magnitude 3.9 earthquake was reported early morning near Santa Rosa, Sonoma County, California, USA.
According to the United States Geological Survey, the quake hit on Thursday, March 3rd, 2022, at 3:39 am local time at a very shallow depth of 0.4 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 citizen-seismograph network of RaspberryShake which listed the quake at magnitude 3.9 as well. A third agency, the European-Mediterranean Seismological Centre (EMSC), reported the same quake at magnitude 3.9.
Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.
In Cobb (pop. 1,800) located 4 miles from the epicenter, the quake should have been felt as light shaking.
Weak shaking might have been felt in Russian River (pop. 11,700) located 13 miles from the epicenter, Russian River (pop. 11,700) 13 miles away, Clearlake (pop. 15,200) 14 miles away, and Windsor (pop. 27,500) 16 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Santa Rosa (pop. 175,000) located 23 miles from the epicenter, Rohnert Park (pop. 42,400) 30 miles away, Petaluma (pop. 60,400) 38 miles away, and Napa (pop. 80,400) 42 miles away.
According to the United States Geological Survey, the quake hit on Thursday, March 3rd, 2022, at 3:39 am local time at a very shallow depth of 0.4 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 citizen-seismograph network of RaspberryShake which listed the quake at magnitude 3.9 as well. A third agency, the European-Mediterranean Seismological Centre (EMSC), reported the same quake at magnitude 3.9.
Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.
In Cobb (pop. 1,800) located 4 miles from the epicenter, the quake should have been felt as light shaking.
Weak shaking might have been felt in Russian River (pop. 11,700) located 13 miles from the epicenter, Russian River (pop. 11,700) 13 miles away, Clearlake (pop. 15,200) 14 miles away, and Windsor (pop. 27,500) 16 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Santa Rosa (pop. 175,000) located 23 miles from the epicenter, Rohnert Park (pop. 42,400) 30 miles away, Petaluma (pop. 60,400) 38 miles away, and Napa (pop. 80,400) 42 miles away.
Earthquake data
Earthquake details
| Date & time | Mar 3, 2022 11:39:58 UTC - |
| Local time at epicenter | Thursday, Mar 3, 2022 at 3:39 am (GMT -8) |
| Status | Confirmed |
| Magnitude | 3.8 |
| Depth | 0.4 km |
| Epicenter latitude / longitude | 38.7805°N / 122.75817°W  (Sonoma, California, United States) |
| Antipode | 38.781°S / 57.242°E |
| Shaking intensity | Light shaking |
| Felt | 1 report |
| Primary data source | USGS (United States Geological Survey) |
| Nearest volcano | Clear Lake (21 km / 13 mi) |
| Nearby towns and cities | 6 km (3 mi) SSW of Cobb (pop: 1,780) | Show on map | Quakes nearby 21 km (13 mi) NNE of Russian River (Sonoma County) (pop: 11,700) | Show on map | Quakes nearby 21 km (13 mi) NNE of Russian River (pop: 11,700) | Show on map | Quakes nearby 23 km (14 mi) SSW of Clearlake (Lake County) (pop: 15,200) | Show on map | Quakes nearby 26 km (16 mi) N of Windsor (Sonoma County) (pop: 27,500) | Show on map | Quakes nearby 38 km (24 mi) N of Santa Rosa (pop: 175,000) | Show on map | Quakes nearby 49 km (31 mi) N of Rohnert Park (pop: 42,400) | Show on map | Quakes nearby 62 km (38 mi) N of Petaluma (pop: 60,400) | Show on map | Quakes nearby 68 km (42 mi) NW of Napa (pop: 80,400) | Show on map | Quakes nearby 112 km (70 mi) W of Sacramento (pop: 490,700) | Show on map | Quakes nearby |
| Weather at epicenter at time of quake | Overcast Clouds  4.4°C (40 F), humidity: 80%, wind: 2 m/s (3 kts) from NW |
| Estimated seismic energy released | 3.2 x 1010 joules (8.78 megawatt hours, equivalent to 7.56 tons of TNT) | about seismic energy |
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. | Depth | Location | Source |
| 3.8 | 0.4 km | 0km NNW of The Geysers, CA | USGS |
| 3.9 | 5 km | NORTHERN CALIFORNIA | EMSC |
| 3.8 | 0.4 km | Northern California | RaspberryShake |
User reports for this quake (1)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Earlier earthquakes in the same area
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