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: 16 mi east of Oxnard, Ventura County, California, USA, 18 April 2021 12:38 GMT -

Our monitoring service AllQuakes received reports of an earthquake in or near Near Oxnard, California, USA at around 12:38 GMT. Unless confirmed by at least one national or international seismological agency, its status remains unconfirmed.
Unconfirmed quake reported: 16 mi east of Oxnard, Ventura County, California, USA, 18 April 2021 12:38 GMT
18 Apr 12:57 UTC: First to report: VolcanoDiscovery after 19 minutes.
Date & time: 18 Apr 2021 12:38:45 UTC -
Magnitude: unknown
Depth: 10.0 km
Epicenter latitude / longitude: 34.21471°N / 118.88984°W (California, United States)
Nearest volcano: Lavic Lake (216 km / 134 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 (2)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Thousand Oaks ca (0 km NE of epicenter) [Map] / Very weak shaking (MMI II) / 2-5 s : Woke me up.  
VENTURA,CA (37.4 km W of epicenter) [Map] / not felt
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