Quake Info: Unconfirmed quake reported: 17 miles north of Vancouver, Clark County, Washington, USA, April 25, 2021, 9:34 PM 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.
25 Apr 22:39 UTC: First report: VolcanoDiscovery after 1 hour and 5 minutes.
I felt this tremor
I didn’t feel it
Date and time: April 25, 2021 21:34:41 UTC –
Size: unknown
Depth: 10.0 km
Latitude / Longitude of epicenter: 45.87083 ° N / 122.57002 ° W. 
(Washington, United States)
Nearest volcano: west crater (38 km)
Primary data source: VolcanoDiscovery
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User reports for this quake (1)
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La Center (0 km southeast of the epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s : It felt like a big dog was scratching but the dog was outside and then it happened again and I yelled at my husband, did you feel or hear it? More than 20 years ago.
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