How frequent are earthquakes in the area near the epicenter of this quake (within 100 km/61 mi)?

Q: How frequent are earthquakes in the area near the epicenter of this quake (within 100 km/61 mi)?

The area where this quake occurred has a high level of seismic activity. Based on data from the past 14 years and our earthquake archive back to 1900, there are about 11,000 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi). 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.

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Mag. 1.8 quake - Sonoma County, 13 mi southwest of Clearlake, Lake County, California, United States, on Monday, Oct 31, 2022, at 05:47 am (GMT +0)

A light magnitude 1.8 earthquake hit 21 km (13 mi) away from Clearlake, California, United States, in the early morning of Monday, Oct 31, 2022 at 5.47 am local time (GMT +0). The quake had a very shallow depth of 1.4 km (0.9 mi) and was too small to be felt by people.

Mag. 1.8 quake - Sonoma County, 13 mi southwest of Clearlake, Lake County, California, United States, on Monday, Oct 31, 2022, at 05:47 am (GMT +0)

Minor magnitude 1.8 earthquake at 1 km depth

31 Oct 05:49 UTC: First to report: USGS after 2 minutes.

Earthquake details

Date & time	Oct 31, 2022 05:47:47 UTC
Local time at epicenter	Monday, Oct 31, 2022, at 05:47 am (GMT +0)
Status	Confirmed
Magnitude	1.8
Depth	1.4 km
Epicenter latitude / longitude	38.8265°N / 122.7998°W Sonoma, California, United States
Seismic antipode	38.8265°S / 57.2002°E
Shaking intensity	II Very weak shaking
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Clear Lake (16 km / 10 mi)
Weather at epicenter at time of quake	Clear Sky 8.1°C (47 F), humidity: 70%, wind: 1 m/s (3 kts) from N
Estimated seismic energy released	3.2 x 10⁷ joules (8.78 kilowatt hours) \| about seismic energy

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Most recent quakes Top 20 past 24 hrs Quakes in the US California

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 6.7 km (4.1 mi) distance east 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
7 km (4 mi) E of epicenter	Cobb (pop: 1,780)	II: Very weak	Lake, California	United States
16 km (10 mi) SW of epicenter	Geyserville (pop: 862)	I: Not felt	Sonoma, California	United States
17 km (11 mi) N of epicenter	Kelseyville (pop: 3,350)	I: Not felt	Lake, California	United States
19 km (12 mi) W of epicenter	Cloverdale (pop: 8,810)	I: Not felt	Sonoma, California	United States
21 km (13 mi) NE of epicenter	Clearlake (pop: 15,200)	I: Not felt	Lake, California	United States
21 km (13 mi) E of epicenter	Hidden Valley Lake (pop: 5,580)	I: Not felt	Lake, California	United States
25 km (15 mi) S of epicenter	Russian River (pop: 11,700)	I: Not felt	Sonoma, California	United States
31 km (19 mi) N of epicenter	North Lakeport (pop: 3,310)	I: Not felt	Lake, California	United States
31 km (19 mi) S of epicenter	Windsor (pop: 27,500)	I: Not felt	Sonoma, California	United States
34 km (21 mi) SE of epicenter	Calistoga (pop: 5,330)	: Not felt	Napa, California	United States
40 km (25 mi) SW of epicenter	Guerneville (pop: 4,530)	: Not felt	Sonoma, California	United States
44 km (27 mi) S of epicenter	Santa Rosa (pop: 175,000)	: Not felt	Sonoma, California	United States
46 km (28 mi) SE of epicenter	Saint Helena (pop: 5,810)	: Not felt	Napa, California	United States
47 km (29 mi) S of epicenter	Sebastopol (pop: 7,680)	: Not felt	Sonoma, California	United States
48 km (30 mi) S of epicenter	Occidental (pop: 1,120)	: Not felt	Sonoma, California	United States
50 km (31 mi) NW of epicenter	Ukiah (pop: 15,900)	: Not felt	Mendocino, California	United States
55 km (34 mi) S of epicenter	Rohnert Park (pop: 42,400)	: Not felt	Sonoma, California	United States
66 km (41 mi) SE of epicenter	Sonoma (pop: 11,000)	: Not felt	California	United States
68 km (42 mi) S of epicenter	Petaluma (pop: 60,400)	: Not felt	Sonoma, California	United States
74 km (46 mi) SE of epicenter	Napa (pop: 80,400)	: Not felt	California	United States
82 km (51 mi) S of epicenter	Novato (pop: 55,500)	: Not felt	Marin, California	United States
86 km (54 mi) SE of epicenter	American Canyon (pop: 20,600)	: Not felt	Napa, California	United States
88 km (55 mi) SE of epicenter	Vacaville (pop: 96,800)	: Not felt	Solano, California	United States
91 km (56 mi) E of epicenter	Woodland (pop: 58,600)	: Not felt	Yolo, California	United States
92 km (57 mi) SE of epicenter	Fairfield (pop: 113,000)	: Not felt	Solano, California	United States
93 km (58 mi) SE of epicenter	Suisun (pop: 28,100)	: Not felt	Solano, California	United States
93 km (58 mi) SE of epicenter	Vallejo (pop: 121,300)	: Not felt	Solano, California	United States
95 km (59 mi) SE of epicenter	Dixon (pop: 19,400)	: Not felt	Solano, California	United States
97 km (60 mi) S of epicenter	San Anselmo (pop: 12,700)	: Not felt	Marin, California	United States
97 km (60 mi) E of epicenter	Davis (pop: 67,700)	: Not felt	Yolo, California	United States
98 km (61 mi) S of epicenter	San Rafael (pop: 59,200)	: Not felt	Marin, California	United States
103 km (64 mi) SE of epicenter	Benicia (pop: 28,200)	: Not felt	Solano, California	United States
104 km (65 mi) SE of epicenter	San Pablo (pop: 30,400)	: Not felt	Contra Costa, California	United States
107 km (66 mi) S of epicenter	Richmond (pop: 109,700)	: Not felt	Contra Costa, California	United States
107 km (66 mi) SE of epicenter	Martinez (pop: 38,100)	: Not felt	Contra Costa, California	United States
116 km (72 mi) SE of epicenter	Concord (pop: 128,700)	: Not felt	Contra Costa, California	United States
117 km (72 mi) E of epicenter	Sacramento (pop: 490,700)	: Not felt	California	United States
119 km (74 mi) SE of epicenter	Pittsburg (pop: 69,400)	: Not felt	Contra Costa, California	United States
126 km (78 mi) SE of epicenter	Antioch (pop: 110,500)	: Not felt	Contra Costa, California	United States
138 km (86 mi) SE of epicenter	Brentwood (pop: 59,000)	: Not felt	Contra Costa, California	United States

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 1.8, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.
If you felt it, be the first to report it!

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 2022-10-31	Epicenter	Agency
1.8	1.4 km 0.9 mi	05:47:47	7km NW of The Geysers, CA	USGS (United States Geological Survey)
1.8	1.4 km 0.9 mi	05:47:47	Northern California 0 km (0 mi) epicenter difference with USGS	RaspberryShake (RaspberryShake)
1.8	10 km 6.2 mi (*)	05:47:47	Northern California 0 km (0 mi) epicenter difference with USGS	IRIS (Incorporated Research Institutions for Seismology)

Notes:
(*) A depth given as 10 km often means that the the depth of the quake could not determined with sufficient accuracy.

Seismograms

Seismic station: Marconi Conference Center, Marshall, CA, USA (MCCM/BK network) | Distance from quake: 76 km / 47 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

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Seismic station Marconi Conference Center, Marshall, CA, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Marconi Conference Center, Marshall, CA, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake, showing horizontal E-W and N-S ground movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Columbia College, Columbia, CA, USA (CMB/BK network) | Distance from quake: 228 km / 142 mi | Show on map | Station Info

Seismic station Columbia College, Columbia, CA, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Columbia College, Columbia, CA, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Columbia College, Columbia, CA, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: San Andreas Geophysical Obs., Hollister, CA, USA (SAO/BK network) | Distance from quake: 258 km / 160 mi | Show on map | Station Info

Seismic station San Andreas Geophysical Obs., Hollister, CA, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station San Andreas Geophysical Obs., Hollister, CA, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station San Andreas Geophysical Obs., Hollister, CA, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Mammoth (MLAC/CI network) | Distance from quake: 371 km / 230 mi | Show on map | Station Info

Seismic station Mammoth: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Mammoth: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Mammoth: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: NVAR Array Site 31, Mina, NV, USA (NV31/IM network) | Distance from quake: 406 km / 252 mi | Show on map | Station Info

Seismic station NVAR Array Site 31, Mina, NV, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station NVAR Array Site 31, Mina, NV, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station NVAR Array Site 31, Mina, NV, USA: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Earthquake statistics

Average number of earthquakes

Based on data from the past 14 years and our earthquake archive back to 1900, there are about 11,000 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: 0.16 quakes per year (or 1 quake every 6.4 years)
Mag. 4 or higher: 2.7 quakes per year
Mag. 3 or higher: 30.9 quakes per year (or 2.6 quakes per month)
Mag. 2 or higher: 457 quakes per year (or 38.1 quakes per month)
Mag. 1 or higher: 4,300 quakes per year (or 11.6 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 to embed or share

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