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:

Sismo non confermato: Contea di Los Angeles County, 47 km a sud ovest da Huntington Beach, Contea di Orange County, Contea di Kern, Stati Uniti, Tue, 4 May 2021 05:38 -

Although our monitoring service initially detected network activity typical for an earthquake, there was no confirmation by any national or international seismological agency. For this reason, it is highly unlikely, that it was caused by an earthquake.
Sismo non confermato: Contea di Los Angeles County, 47 km a sud ovest da Huntington Beach, Contea di Orange County, Contea di Kern, Stati Uniti, Tue, 4 May 2021 05:38
4 May 05:40 UTC: Primo a segnalare: VolcanoDiscovery dopo 3 minuti.
Data & ora: 4 May 2021 05:38:07 UTC -
Magnitudine: sconosciuto
Profondità: 10.0 km
Epicentro latitudine / longitudine: 33.34318°N / 118.32662°W (Contea di Los Angeles, Contea di Kern, Stati Uniti)
Vulcano più vicino: Lavic Lake (222 km / 138 mi)
Fonte dati primaria: 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 (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Avalon, CA (0 km NNE of epicenter) [Map] / Very weak shaking (MMI II) : felt beds shaking gently but constantly for 30 seconds  
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