It is assumed that this record was not from an actual earthquake. It could be due to another (unknown) event causing the shock, such as B. Weather and sonic booms. In other cases, officially reported quakes are sometimes removed later.
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:
Our monitoring service, AllQuakes, received reports of an earthquake in or near San Francisco, California, USA at around 2:55 p.m. GMT. Unless at least one national or international seismological agency confirms this, their status remains unconfirmed.
19 Apr 16:05 UTC: First report: VolcanoDiscovery after 1 hour and 10 minutes.
I felt this tremor
I didn’t feel it
Date and time: April 19, 2021 14:55:32 UTC –
Depth: 10.0 km
Latitude / Longitude of epicenter: 37.65859 ° N / 122.4693 ° W. (California, USA)
Nearest volcano: Clear Lake (148 km)
Primary data source: VolcanoDiscovery
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Data for the same earthquake reported by different authorities
Info: The more agencies report on the same quake and publish similar data, the more confidence you can have in the data. It usually takes up to a few hours for the earthquake parameters to be calculated with near optimal accuracy.
User reports for this quake (2)
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City of Daly (0 km northeast of the epicenter) [Map] / Weak shaking (MMI III) / single vertical bump / 1-2 s : A truck drove over the house
South San Francisco / Very weak shaking (MMI II) / single vertical bump / very brief
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