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Mag. 2.4 quake - Lake County, 13 mi east of Ukiah, Mendocino County, California, USA, on Monday, Dec 27, 2021, at 07:48 am (Los Angeles time)

A light magnitude 2.4 earthquake hit 21 km (13 mi) away from Ukiah, California,  United States, in the morning of Monday, Dec 27, 2021 at 7.48 am local time (America/Los Angeles GMT -7). The quake had a very shallow depth of 0.4 km (0.2 mi) and was not felt (or at least not reported so).

Mag. 2.4 quake - Lake County, 13 mi east of Ukiah, Mendocino County, California, USA, on Monday, Dec 27, 2021, at 07:48 am (Los Angeles time) Mag. 2.4 quake - Lake County, 13 mi east of Ukiah, Mendocino County, California, USA, on Monday, Dec 27, 2021, at 07:48 am (Los Angeles time)

Weak magnitude 2.4 earthquake at 0 km depth

27 Dec 14:50 UTC: First to report: USGS after 2 minutes.

Earthquake details

Date & timeDec 27, 2021 14:48:13 UTC
Local time at epicenterMonday, Dec 27, 2021, at 07:48 am (America/Los Angeles GMT -7)
StatusConfirmed
Magnitude2.4
Depth0.4 km
Epicenter latitude / longitude39.1048°N / 122.9725°W Lake, California, United States
Seismic antipode39.1048°S / 57.0275°E
Shaking intensityWeak shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoClear Lake (23 km / 14 mi)
Weather at epicenter at time of quakeOvercast Clouds 2.4°C (36 F), humidity: 87%, wind: 3 m/s (5 kts) from SSW
Estimated seismic energy released2.5 x 108 joules (69.8 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 North Lakeport, a town with 3,300 inhabitants in the United States, in 6.1 km (3.8 mi) distance east of the epicenter. People likely experienced 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)
E of epicenter
North Lakeport
(pop: 3,310)
III: Weak
Lake, California
18 km (11 mi)
SE of epicenter
Kelseyville
(pop: 3,350)
II: Very weak
Lake, California
19 km (12 mi)
SW of epicenter
Hopland
(pop: 756)
II: Very weak
Mendocino, California
21 km (13 mi)
W of epicenter
Ukiah
(pop: 15,900)
II: Very weak
Mendocino, California
27 km (17 mi)
NW of epicenter
Redwood Valley
(pop: 1,730)
I: Not felt
Mendocino, California
27 km (17 mi)
NW of epicenter
Potter Valley
(pop: 646)
I: Not felt
Mendocino, California
34 km (21 mi)
S of epicenter
Cloverdale
(pop: 8,810)
I: Not felt
Sonoma, California
34 km (21 mi)
SE of epicenter
Clearlake
(pop: 15,200)
I: Not felt
Lake, California
36 km (22 mi)
W of epicenter
Boonville
(pop: 1,040)
I: Not felt
Mendocino, California
38 km (24 mi)
SE of epicenter
Cobb
(pop: 1,780)
I: Not felt
Lake, California
47 km (29 mi)
NW of epicenter
Little Lake
(pop: 4,860)
I: Not felt
Mendocino, California
49 km (30 mi)
SE of epicenter
Hidden Valley Lake
(pop: 5,580)
I: Not felt
Lake, California
56 km (35 mi)
S of epicenter
Russian River
(pop: 11,700)
I: Not felt
Sonoma, California
60 km (37 mi)
SW of epicenter
The Sea Ranch
(pop: 1,310)
I: Not felt
Sonoma, California
63 km (39 mi)
S of epicenter
Windsor
(pop: 27,500)
I: Not felt
Sonoma, California
67 km (42 mi)
S of epicenter
Guerneville
(pop: 4,530)
I: Not felt
Sonoma, California
68 km (42 mi)
SE of epicenter
Calistoga
(pop: 5,330)
I: Not felt
Napa, California
70 km (43 mi)
E of epicenter
Maxwell
(pop: 1,100)
I: Not felt
Colusa, California
71 km (44 mi)
E of epicenter
Central
(pop: 5,200)
I: Not felt
Colusa, California
77 km (48 mi)
S of epicenter
Santa Rosa
(pop: 175,000)
: Not felt
Sonoma, California
78 km (49 mi)
NW of epicenter
Laytonville
(pop: 1,230)
: Not felt
Mendocino, California
79 km (49 mi)
S of epicenter
Sebastopol
(pop: 7,680)
: Not felt
Sonoma, California
80 km (49 mi)
E of epicenter
Arbuckle
(pop: 3,030)
: Not felt
Colusa, California
80 km (49 mi)
SE of epicenter
Saint Helena
(pop: 5,810)
: Not felt
Napa, California
80 km (50 mi)
N of epicenter
Covelo
(pop: 1,260)
: Not felt
Mendocino, California
81 km (50 mi)
NW of epicenter
Fort Bragg
(pop: 7,290)
: Not felt
Mendocino, California
82 km (51 mi)
NE of epicenter
Willows
(pop: 6,070)
: Not felt
Glenn, California
84 km (52 mi)
E of epicenter
Colusa
(pop: 5,940)
: Not felt
California
88 km (55 mi)
S of epicenter
Rohnert Park
(pop: 42,400)
: Not felt
Sonoma, California
98 km (61 mi)
SE of epicenter
Boyes Hot Springs
(pop: 6,660)
: Not felt
Sonoma, California
98 km (61 mi)
NE of epicenter
Orland
(pop: 7,550)
: Not felt
Glenn, California
100 km (62 mi)
SE of epicenter
Cottonwood
(pop: 3,850)
: Not felt
Yolo, California
101 km (63 mi)
S of epicenter
Petaluma
(pop: 60,400)
: Not felt
Sonoma, California
108 km (67 mi)
SE of epicenter
Napa
(pop: 80,400)
: Not felt
California
119 km (74 mi)
SE of epicenter
Vacaville
(pop: 96,800)
: Not felt
Solano, California
120 km (74 mi)
NE of epicenter
Chico
(pop: 90,300)
: Not felt
Butte, California
124 km (77 mi)
SE of epicenter
Dixon
(pop: 19,400)
: Not felt
Solano, California
125 km (78 mi)
SE of epicenter
Fairfield
(pop: 113,000)
: Not felt
Solano, California
126 km (78 mi)
SE of epicenter
Suisun
(pop: 28,100)
: Not felt
Solano, California
141 km (87 mi)
SE of epicenter
Sacramento
(pop: 490,700)
: Not felt
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 2.4, this quake might have been felt very close to the epicenter and under calm 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
2021-12-27
Epicenter Agency
2.4 0.4 km
0.2 mi
14:48:13 6km WNW of North Lakeport, CA USGS (United States Geological Survey)
2.4 0 km
0 mi
14:48:13 NORTHERN CALIFORNIA
0.6 km (0.4 mi) epicenter difference with USGS
EMSC (European-Mediterranean Seismological Centre)
2.4 0.4 km
0.2 mi
14:48:13 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: 107 km / 67 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. 5 or higher: 0.04 quakes per year (or 1 quake every 27 years)
  • Mag. 4 or higher: 2.1 quakes per year
  • Mag. 3 or higher: 31.4 quakes per year
  • Mag. 2 or higher: 499 quakes per year (or 42 quakes per month)
  • Mag. 1 or higher: 4,000 quakes per year (or 10.8 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 5 since 1970, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 25 to 30 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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