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.

Minor Mag. 1.0 Earthquake - 4km W of Cobb, CA, on Wednesday, Sep 28, 2022, at 12:11 pm (Los Angeles Time)

Earthquake details

Date & time	Sep 28, 2022 19:11:57 UTC
Local time at epicenter	Wednesday, Sep 28, 2022, at 12:11 pm (America/Los Angeles GMT -7)
Status	Confirmed
Magnitude	1.0
Depth	1.9 km
Epicenter latitude / longitude	38.8255°N / 122.7637°W Lake, California, United States
Seismic antipode	38.8255°S / 57.2363°E
Shaking intensity	Not felt
Felt
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 22.6°C (73 F), humidity: 30%, wind: 3 m/s (6 kts) from W
Estimated seismic energy released	2 x 10⁶ joules (0.554 kilowatt hours) \| about seismic energy

[smaller] [bigger]

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

Nearby places

The closest larger town near the epicenter is Cobb, a town with 1,800 inhabitants in the United States, in 3.5 km (2.2 mi) distance to the east, but it is unlikely that the quake was felt there.

Distance	Place	Max. shaking intensity(*)	Region	Country
4 km (2 mi) E of epicenter	Cobb (pop: 1,780)	I: Not felt	Lake, California	United States
18 km (11 mi) E of epicenter	Hidden Valley Lake (pop: 5,580)	: Not felt	Lake, California	United States
18 km (11 mi) N of epicenter	Kelseyville (pop: 3,350)	: Not felt	Lake, California	United States
19 km (12 mi) NE of epicenter	Clearlake (pop: 15,200)	: Not felt	Lake, California	United States
22 km (14 mi) W of epicenter	Cloverdale (pop: 8,810)	: Not felt	Sonoma, California	United States
26 km (16 mi) S of epicenter	Russian River (pop: 11,700)	: Not felt	Sonoma, California	United States
30 km (18 mi) N of epicenter	Lucerne (pop: 3,070)	: Not felt	Lake, California	United States
31 km (19 mi) S of epicenter	Windsor (pop: 27,500)	: Not felt	Sonoma, California	United States
32 km (20 mi) SE of epicenter	Calistoga (pop: 5,330)	: Not felt	Napa, California	United States
40 km (25 mi) N of epicenter	Upper Lake (pop: 1,050)	: Not felt	Lake, California	United States
41 km (26 mi) SW of epicenter	Guerneville (pop: 4,530)	: Not felt	Sonoma, California	United States
43 km (27 mi) S of epicenter	Santa Rosa (pop: 175,000)	: Not felt	Sonoma, California	United States
44 km (27 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
49 km (31 mi) S of epicenter	Occidental (pop: 1,120)	: Not felt	Sonoma, California	United States
50 km (31 mi) SE of epicenter	Kenwood (pop: 1,030)	: Not felt	Sonoma, California	United States
53 km (33 mi) NW of epicenter	Ukiah (pop: 15,900)	: Not felt	Mendocino, California	United States
54 km (34 mi) S of epicenter	Rohnert Park (pop: 42,400)	: Not felt	Sonoma, California	United States
65 km (40 mi) SE of epicenter	Sonoma (pop: 11,000)	: Not felt	California	United States
67 km (42 mi) S of epicenter	Petaluma (pop: 60,400)	: Not felt	Sonoma, California	United States
72 km (45 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
85 km (53 mi) SE of epicenter	American Canyon (pop: 20,600)	: Not felt	Napa, California	United States
85 km (53 mi) SE of epicenter	Vacaville (pop: 96,800)	: Not felt	Solano, California	United States
87 km (54 mi) E of epicenter	Woodland (pop: 58,600)	: Not felt	Yolo, California	United States
90 km (56 mi) SE of epicenter	Fairfield (pop: 113,000)	: Not felt	Solano, California	United States
91 km (56 mi) SE of epicenter	Suisun (pop: 28,100)	: Not felt	Solano, California	United States
92 km (57 mi) SE of epicenter	Vallejo (pop: 121,300)	: Not felt	Solano, California	United States
92 km (57 mi) SE of epicenter	Dixon (pop: 19,400)	: Not felt	Solano, California	United States
94 km (59 mi) E of epicenter	Davis (pop: 67,700)	: Not felt	Yolo, California	United States
97 km (60 mi) S of epicenter	San Rafael (pop: 59,200)	: Not felt	Marin, California	United States
99 km (62 mi) SE of epicenter	Hercules (pop: 25,300)	: Not felt	Contra Costa, California	United States
100 km (62 mi) SE of epicenter	Pinole (pop: 19,300)	: Not felt	Contra Costa, California	United States
105 km (65 mi) SE of epicenter	Martinez (pop: 38,100)	: Not felt	Contra Costa, California	United States
105 km (65 mi) E of epicenter	Yuba City (pop: 66,900)	: Not felt	Sutter, California	United States
105 km (65 mi) S of epicenter	Richmond (pop: 109,700)	: Not felt	Contra Costa, California	United States
113 km (71 mi) E of epicenter	Sacramento (pop: 490,700)	: Not felt	California	United States
114 km (71 mi) SE of epicenter	Concord (pop: 128,700)	: Not felt	Contra Costa, California	United States
117 km (73 mi) SE of epicenter	Pittsburg (pop: 69,400)	: Not felt	Contra Costa, California	United States
124 km (77 mi) SE of epicenter	Antioch (pop: 110,500)	: 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

At magnitude 1.0, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.

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 2022-09-28	Epicenter	Agency
1.0	1.9 km 1.2 mi	19:11:57	4km W of Cobb, CA	USGS (United States Geological Survey)
1.0	1.9 km 1.2 mi	19:11:57	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: 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

Show less

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: 225 km / 140 mi | Show on map | Station Info

Seismic station Columbia College, Columbia, 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

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: 257 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)

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

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: 368 km / 229 mi | Show on map | Station Info

Seismic station Mammoth: 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

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: 403 km / 250 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)

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

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: 31.2 quakes per year (or 2.6 quakes per month)
Mag. 2 or higher: 459 quakes per year (or 38.3 quakes per month)
Mag. 1 or higher: 4,300 quakes per year (or 11.7 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.