The record of this quake is likely a duplicate. In rare cases, originally reported quakes turn later out not to have been earthquakes.
This can happen if initial automatic calculations return an earthquake, but turn out to be wrong during subsequent (manual) revision.

The initial report is below:

Unconfirmed quake California, USA, 18 January 2021 02:59 GMT -

Our monitoring service AllQuakes received reports of an earthquake in or near California, USA at around 02:59 GMT. Unless confirmed by at least one national or international seismological agency, its status remains unconfirmed.
Unconfirmed quake California, USA, 18 January 2021 02:59 GMT
18 Jan 03:01 UTC: First to report: VolcanoDiscovery after 2 minutes.
Date & time: 18 Jan 2021 02:59:00 UTC -
Magnitude: estimated 4.0 or higher
Depth: 10.0 km
Epicenter latitude / longitude: 37.25022°N / 119.75126°W (United States)
Nearest volcano: Mammoth Mountain (76 km / 47 mi)
Primary data source: VolcanoDiscovery
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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.
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User reports for this quake (6)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Gardena, California / not felt : Did not feel this on the day of the Earthquake (Jan 18th). Reporting to this survey because today, (Jan 20th), I felt an earthquake/the aftershock in Gardena area.
Oakland, California / Weak shaking (MMI III) : Sleeping, woke up to mild shaking and a bit jerky. Live in a ground floor unit, often feel shakiness like someone is shaking the bed.
Hawthorne, California / Very weak shaking (MMI II) / rattling, vibrating / 10-15 s
Auburn California / Moderate shaking (MMI V) / 2-5 s
Santa Rosa, CA / Light shaking (MMI IV) / 1-2 s
santa rosa ca / Weak shaking (MMI III) : Sitting on the sofa a loud bang and noticible shake
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