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Quake information: Unconfirmed quake reported: Close to San Francisco, California, USA, 20 April 2021 06:44 GMT

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 surveillance service AllQuakes received reports of an earthquake in or near San Francisco, California, USA at around 6:44 am GMT. Unless at least one national or international seismological agency confirms this, their status remains unconfirmed.

20 Apr 06:47 UTC: First report: VolcanoDiscovery after 3 minutes.

I felt this tremor

I didn’t feel it

Date and time: April 20, 2021 06:44:32 UTC –
Size: unknown
Depth: 10.0 km
Latitude / Longitude of epicenter: 37.75952 ° N / 122.421 ° W. (California, USA)
Nearest volcano: Clear Lake (138 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.

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User reports for this quake (2)

Leave a comment if you find a particular report interesting or want to add to it.
Report as inappropriate.

San Francisco, CA (0 km ESE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s

Santa Clara / weak shaking (MMI III) / both vertical and horizontal swing / 20-30 s : Body swayed on the couch in my house

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