Quake data: Unconfirmed quake reported: 9.four mi east of San Francisco, California, USA, Eight Could 2021 07:41 GMT
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.
May 8, 23:19 UTC: First report: VolcanoDiscovery after 16 hours.
I felt this tremor
I didn’t feel it
Date and time: May 8, 2021 07:41:10 UTC –
Depth: 10.0 km
Latitude / Longitude of epicenter: 37.81086 ° N / 122.25323 ° W. (California, USA)
Nearest volcano: Clear Lake (137 km)
Primary data source: VolcanoDiscovery
If you felt this quake (or if you were near the epicenter) please share your experience with us and submit a short “I Felt It” report! Other users would love to hear about it!
Even if you did NOT feel the quake even though you were in the area, please Report it! Your contribution is also useful for earthquake research and for earthquake hazard analysis and mitigation. You can use your device’s location or the map to tell you where you were during the earthquake. Many Thanks!
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.
|not specified||n / A||Near San Francisco, California, USA||VolcanoDiscovery|
User reports for this quake (1)
Leave a comment if you find a particular report interesting or want to add to it.
Report as inappropriate.
Mark as helpful or interesting.
Submit your own user report!
0 km southwest of the epicenter [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s
Try our free app!
Previous earthquakes in the same area
Please wait as we search millions of records.
This can take up to 20-30 seconds.
Click here to search our database for previous earthquakes in the same region since 1900!
Support us – Help us to improve our services!
We really love bringing you the latest data on volcanoes and earthquakes from around the world. However, maintaining our website and our free apps requires a lot of time and resources.
We need funding to increase hardware and software capacity and to support our editorial team. We strive to ensure uninterrupted operations wherever an earthquake or volcanic eruption occurs, and your donations can make it possible! Every donation is very much appreciated. If you find the information useful and would like to help our team integrate more features, write great content, and update our software and hardware, please donate (PayPal or online credit card payment).
- Weather reports
- Tsunami warnings
- Design upgrades
- Faster responsiveness
Thanks to your previous donations, these features have recently been added:
- Earthquake archive from 1900
- Additional seismic data sources
- Improved content in English
Download and update the Volcanoes & Earthquakes app for one of the fastest earthquake and volcano alerts online:
Android | Thank you!