Quake information: Reported (unconfirmed) earthquake: San Francisco County, 3.5 mi northwest of Daly Metropolis, San Mateo County, California, USA, 24 April 2021 17:36 GMT
It is assumed that this record was not from an actual earthquake. This may be due to some other (unknown) event that causes tremors, e.g. B. Explosions, sonic booms, weather or other human or natural causes. Even officially reported earthquakes are sometimes removed again later when seismic signals that were initially processed automatically are later manually reinterpreted so that they do not originate from real 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.
24 Apr 17:38 UTC: First report: VolcanoDiscovery after 2 minutes.
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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 north of the epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s
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