M3.0 Earthquake 63 km WNW of Petrolia, CA — April 27, 2025
2025-04-27 21:18:21 UTC (2025-04-27) · approx. 1:18 PM UTC-8 local
On April 27, 2025 at 21:18 UTC, a magnitude 3.0 shallow crustal earthquake struck 63 km WNW of Petrolia, CA, at a depth of 10.0 km and coordinates 40.4457°, -125.0145°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 567 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 77 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-125.0145°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Petrolia, CA?
The magnitude 3.0 earthquake that struck 63 km WNW of Petrolia, CA on April 27, 2025 at 21:18 UTC had a depth of 10.0 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: nc75172831). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 27, 2025). M3.0 Earthquake 63 km WNW of Petrolia, CA — April 27, 2025. Retrieved July 11, 2025 from https://www.earthquaketracker.org/earthquakes/event/nc75172831/