The record of this quake is likely a duplicate. In rare cases it turned out that quakes originally reported were later not earthquakes.
This can happen when initial automatic calculations return an earthquake, but turn out to be incorrect in subsequent (manual) revision.
The first report is below:
Although our monitoring service initially determined network activity typical of an earthquake, there was no confirmation from a national or international seismological agency. Because of this, it is highly unlikely that it was caused by an earthquake.
11 Apr 10:50 UTC: First report: VolcanoDiscovery after 7 minutes.
I felt this tremor
I didn’t feel it
Date and time: April 11, 2021 10:44:25 UTC –
Depth: 10.0 km
Latitude / Longitude of epicenter: 37.78044 ° N / 122.46206 ° W. (California, USA)
Nearest volcano: Clear Lake (135 km)
Primary data source: VolcanoDiscovery
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Data for the same earthquake reported by different authorities
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User reports for this quake (1)
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San Francisco (0 km southeast of the epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 5-10 s
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