M4.0 Earthquake 66 km W of Petrolia, CA — April 24, 2026
2026-04-24 19:29:55 UTC (2 hours ago)
Felt by 15 people across nearby locations.
On April 24, 2026 at 19:29 UTC, a magnitude 4.0 shallow crustal earthquake struck 66 km W of Petrolia, CA, at a depth of 0.5 km and coordinates 40.3655°, -125.0630°. The earthquake was reported felt by 15 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 2.6 (weak). This earthquake was detected by 119 seismic stations with moderate location accuracy and was assigned a USGS significance rating of 246, placing it among routine seismic activity.
The epicenter is located in California, a region characterized by the San Andreas transform fault system, where the Pacific and North American plates slide past each other at roughly 46 mm per year. The nearest mapped fault system is the San Andreas Fault. View all earthquakes in California.
Learn more: San Andreas Fault · Magnitude scale · Aftershock sequences
Earthquake Details
-125.0630°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Petrolia, CA?
The magnitude 4.0 earthquake that struck 66 km W of Petrolia, CA on April 24, 2026 at 19:29 UTC had a depth of 0.5 km. It was felt by 15 people with maximum shaking intensity of MMI 2.6 (weak). For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 40.3655°, -125.0630°, which is 66 km W of Petrolia, CA. View all earthquakes in California.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
Has California had earthquakes this big before?
The largest recorded earthquake in California was the M7.9 Fort Tejon earthquake of January 9, 1857. Today's magnitude 4.0 event is significantly smaller than that historical record.
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.