Quake status: highly uncertain
This record is considered not to be from an actual earthquake, because there is no officially confirmed quake that matches the user reports we received of the reported event closely enough.
In most cases, this event likely reflects something else that caused shaking, such as an explosion (typical for mining areas), a sonic boom, traffic, weather, or some other human or natural cause.
The initial report is below:

Unconfirmed quake reported: California, USA, 14 Apr 9:18 pm (GMT -7) -

Our monitoring service AllQuakes received reports of an earthquake in or near California, USA at around 04:18 GMT. Unless confirmed by at least one national or international seismological agency, its status remains unconfirmed.
Unconfirmed quake reported: California, USA, 14 Apr 9:18 pm (GMT -7)
15 Apr 04:20 UTC: First to report: VolcanoDiscovery after 2 minutes.
Date & time: 15 Apr 2021 04:18:02 UTC -
Local time at epicenter: 14 Apr 9:18 pm (GMT -7)
Magnitude: unknown
Depth: 10.0 km
Epicenter latitude / longitude: 37.25022°N / 119.75126°W (California, United States)
Nearest volcano: Mammoth Mountain (76 km / 47 mi)
Weather at epicenter at time of quake:
Scattered Clouds 6.8°C (44 F), humidity: 59%, wind: 3 m/s (6 kts) from NE
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.
Mag.DepthLocationSource

User reports for this quake (3)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Berkeley / Weak shaking (MMI III) / 2-5 s
Tijuana (585.1 km SSE of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / very short
Tijuana, bc / Weak shaking (MMI III) / complex motion difficult to describe / 15-20 s
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