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Mag. 2.2 quake - 25 mi north of Santa Rosa, Sonoma County, California, USA, on Tuesday, Dec 28, 2021, at 01:29 am (Los Angeles time)

A light magnitude 2.2 earthquake hit 40 km (25 mi) away from Santa Rosa, California,  United States, in the early morning of Tuesday, Dec 28, 2021 at 1.29 am local time (America/Los Angeles GMT -7). The quake had a very shallow depth of 0.8 km (0.5 mi) and was not felt (or at least not reported so).

Mag. 2.2 quake - 25 mi north of Santa Rosa, Sonoma County, California, USA, on Tuesday, Dec 28, 2021, at 01:29 am (Los Angeles time) Mag. 2.2 quake - 25 mi north of Santa Rosa, Sonoma County, California, USA, on Tuesday, Dec 28, 2021, at 01:29 am (Los Angeles time)

Weak magnitude 2.2 earthquake at 1 km depth

28 Dec 08:31 UTC: First to report: USGS after 2 minutes.

Earthquake details

Date & timeDec 28, 2021 08:29:04 UTC
Local time at epicenterTuesday, Dec 28, 2021, at 01:29 am (America/Los Angeles GMT -7)
StatusConfirmed
Magnitude2.2
Depth0.8 km
Epicenter latitude / longitude38.7988°N / 122.7868°W Sonoma, California, United States
Seismic antipode38.7988°S / 57.2132°E
Shaking intensityWeak shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoClear Lake (19 km / 12 mi)
Weather at epicenter at time of quakeBroken Clouds -2.2°C (28 F), humidity: 91%, wind: 2 m/s (4 kts) from NW
Estimated seismic energy released1.3 x 108 joules (35 kilowatt hours) | about seismic energy
Interactive map
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Nearby places

The closest larger town where the quake might have been felt is Cobb, a town with 1,800 inhabitants in the United States, in 6.1 km (3.8 mi) distance northeast of the epicenter. People likely experienced very weak shaking there.
The following table shows some of the places that might have been affected (or not) by the shaking.
Distance Place Max. shaking intensity(*) Region Country
6 km (4 mi)
NE of epicenter
Cobb
(pop: 1,780)
II: Very weak
Lake, California
14 km (9 mi)
SW of epicenter
Geyserville
(pop: 862)
II: Very weak
Sonoma, California
20 km (12 mi)
E of epicenter
Hidden Valley Lake
(pop: 5,580)
I: Not felt
Lake, California
20 km (12 mi)
W of epicenter
Cloverdale
(pop: 8,810)
I: Not felt
Sonoma, California
20 km (13 mi)
N of epicenter
Kelseyville
(pop: 3,350)
I: Not felt
Lake, California
22 km (14 mi)
S of epicenter
Russian River
(pop: 11,700)
I: Not felt
Sonoma, California
23 km (14 mi)
NE of epicenter
Clearlake
(pop: 15,200)
I: Not felt
Lake, California
28 km (17 mi)
S of epicenter
Windsor
(pop: 27,500)
I: Not felt
Sonoma, California
30 km (19 mi)
SE of epicenter
Calistoga
(pop: 5,330)
I: Not felt
Napa, California
32 km (20 mi)
N of epicenter
Lucerne
(pop: 3,070)
I: Not felt
Lake, California
38 km (23 mi)
SW of epicenter
Guerneville
(pop: 4,530)
I: Not felt
Sonoma, California
40 km (25 mi)
S of epicenter
Santa Rosa
(pop: 175,000)
I: Not felt
Sonoma, California
42 km (26 mi)
N of epicenter
Upper Lake
(pop: 1,050)
I: Not felt
Lake, California
43 km (27 mi)
SE of epicenter
Saint Helena
(pop: 5,810)
I: Not felt
Napa, California
44 km (27 mi)
S of epicenter
Sebastopol
(pop: 7,680)
I: Not felt
Sonoma, California
46 km (28 mi)
S of epicenter
Occidental
(pop: 1,120)
I: Not felt
Sonoma, California
48 km (30 mi)
SE of epicenter
Kenwood
(pop: 1,030)
I: Not felt
Sonoma, California
52 km (32 mi)
S of epicenter
Rohnert Park
(pop: 42,400)
I: Not felt
Sonoma, California
53 km (33 mi)
NW of epicenter
Ukiah
(pop: 15,900)
I: Not felt
Mendocino, California
60 km (37 mi)
SE of epicenter
Boyes Hot Springs
(pop: 6,660)
: Not felt
Sonoma, California
63 km (39 mi)
SE of epicenter
Sonoma
(pop: 11,000)
: Not felt
California
64 km (40 mi)
S of epicenter
Petaluma
(pop: 60,400)
: Not felt
Sonoma, California
71 km (44 mi)
SE of epicenter
Napa
(pop: 80,400)
: Not felt
California
79 km (49 mi)
S of epicenter
Novato
(pop: 55,500)
: Not felt
Marin, California
83 km (52 mi)
SE of epicenter
American Canyon
(pop: 20,600)
: Not felt
Napa, California
85 km (53 mi)
SE of epicenter
Vacaville
(pop: 96,800)
: Not felt
Solano, California
89 km (55 mi)
E of epicenter
Woodland
(pop: 58,600)
: Not felt
Yolo, California
89 km (55 mi)
SE of epicenter
Fairfield
(pop: 113,000)
: Not felt
Solano, California
90 km (56 mi)
SE of epicenter
Vallejo
(pop: 121,300)
: Not felt
Solano, California
90 km (56 mi)
SE of epicenter
Suisun
(pop: 28,100)
: Not felt
Solano, California
92 km (57 mi)
SE of epicenter
Dixon
(pop: 19,400)
: Not felt
Solano, California
94 km (59 mi)
S of epicenter
San Rafael
(pop: 59,200)
: Not felt
Marin, California
95 km (59 mi)
E of epicenter
Davis
(pop: 67,700)
: Not felt
Yolo, California
97 km (60 mi)
SE of epicenter
Hercules
(pop: 25,300)
: Not felt
Contra Costa County, California
98 km (61 mi)
SE of epicenter
Pinole
(pop: 19,300)
: Not felt
Contra Costa County, California
100 km (62 mi)
SE of epicenter
Benicia
(pop: 28,200)
: Not felt
Solano, California
103 km (64 mi)
S of epicenter
Richmond
(pop: 109,700)
: Not felt
Contra Costa County, California
113 km (70 mi)
SE of epicenter
Concord
(pop: 128,700)
: Not felt
Contra Costa County, California
115 km (71 mi)
E of epicenter
Sacramento
(pop: 490,700)
: Not felt
California
123 km (76 mi)
SE of epicenter
Antioch
(pop: 110,500)
: Not felt
Contra Costa County, California
Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

User-reports for this quake

There are no user reports for this quake yet.
At magnitude 2.2, such a quake wouldn't normally be felt by people except under very favorable conditions.
If you felt it, be the first to report it!
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

Compare Quake Data

Data for the same earthquake as reported by different agencies

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 Time GMT
2021-12-28
Epicenter Agency
2.2 0.8 km
0.5 mi
08:29:04 4km NW of The Geysers, CA USGS (United States Geological Survey)
2.2 1 km
0.6 mi
08:29:04 NORTHERN CALIFORNIA
0.3 km (0.2 mi) epicenter difference with USGS
EMSC (European-Mediterranean Seismological Centre)
2.2 0.8 km
0.5 mi
08:29:04 Northern California
0 km (0 mi) epicenter difference with USGS
RaspberryShake (RaspberryShake)

Seismograms

Seismic station: Marconi Conference Center, Marshall, CA, USA (MCCM/BK network) | Distance from quake: 73 km / 45 mi | Show on map | Station Info
Seismic station Marconi Conference Center, Marshall, CA, USA: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

Earthquake statistics

Average number of earthquakes

Based on data from the past 10 years and our earthquake archive back to 1900, there are about 100,000 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 6 or higher: 0.02 quakes per year (or 1 quake every 62.5 years)
  • Mag. 5 or higher: 0.05 quakes per year (or 1 quake every 18.9 years)
  • Mag. 4 or higher: 1.95 quakes per year
  • Mag. 3 or higher: 30.2 quakes per year
  • Mag. 2 or higher: 494 quakes per year (or 41 quakes per month)
  • Mag. 1 or higher: 4,000 quakes per year (or 10.9 quakes per day)
The area where this quake occurred has a high level of seismic activity. It has had at least 2 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 60 to 65 years.

Number of quakes per year

Previous quakes in the same area of this earthquake

Map of earlier quakes in the area of this quake

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Map to embed or share

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