M3.4 Earthquake 51 km W of Petrolia, CA — April 21, 2026
2026-04-21 08:58:58 UTC (1 hour ago)
On April 21, 2026 at 08:58 UTC, a magnitude 3.4 shallow crustal earthquake struck 51 km W of Petrolia, CA, at a depth of 3.0 km and coordinates 40.3517°, -124.8893°.
Earthquake Details
-124.8893°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near Petrolia, CA?
The magnitude 3.4 earthquake that struck 51 km W of Petrolia, CA on April 21, 2026 at 08:58 UTC had a depth of 3.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.4 earthquakes can continue for several days and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.