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Minor mag. 1.1 earthquake - 6km NW of The Geysers, CA, on Saturday, Mar 18, 2023 at 11:35 pm (GMT -7) -

Minor magnitude 1.1 earthquake at 2 km depth

19 Mar 06:37 UTC: First to report: USGS after 2 minutes.

Earthquake details

Date & time	Mar 19, 2023 06:35:24 UTC -
Local time at epicenter	Saturday, Mar 18, 2023 at 11:35 pm (GMT -7)
Status	Confirmed
Magnitude	1.1
Depth	2.2 km
Epicenter latitude / longitude	38.81667°N / 122.79517°W (California, United States)
Antipode	38.817°S / 57.205°E
Shaking intensity	Very weak shaking
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Clear Lake (17 km / 11 mi)
Nearby towns and cities	6 km (4 mi) W of Cobb (pop: 1,780) \| Show on map \| Quakes nearby 21 km (13 mi) SW of Clearlake (Lake County) (pop: 15,200) \| Show on map \| Quakes nearby 30 km (19 mi) N of Windsor (Sonoma County) (pop: 27,500) \| Show on map \| Quakes nearby 42 km (26 mi) N of Santa Rosa (pop: 175,000) \| Show on map \| Quakes nearby 66 km (41 mi) NNW of Petaluma (pop: 60,400) \| Show on map \| Quakes nearby 73 km (45 mi) NW of Napa (pop: 80,400) \| Show on map \| Quakes nearby 87 km (54 mi) NW of Vacaville (pop: 96,800) \| Show on map \| Quakes nearby 91 km (57 mi) NW of Fairfield (pop: 113,000) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Moderate Rain 7.4°C (45 F), humidity: 82%, wind: 1 m/s (1 kts) from SE
Estimated seismic energy released	2.8 x 10⁶ joules (0.783 kilowatt hours) \| about seismic energy

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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
1.1	2.2 km	6km NW of The Geysers, CA	USGS
1.1	2.2 km	Northern California	RaspberryShake
1.1	10 km	Northern California	IRIS

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

Seismograms

Seismic station: Marconi Conference Center, Marshall, CA, USA (MCCM/BK network) | Distance from quake: 75 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: 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)

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: 370 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: Valley Oaks Golf Course (VOG/CI network) | Distance from quake: 409 km / 254 mi | Show on map | Station Info

Seismic station Valley Oaks Golf Course: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Valley Oaks Golf Course: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Valley Oaks Golf Course: 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: Tinemaha (TIN/CI network) | Distance from quake: 446 km / 277 mi | Show on map | Station Info

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

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

Seismic station Tinemaha: 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

User reports for this quake

At magnitude 1.1, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.

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