M4.8 Earthquake — 85 km W of Petrolia, CA
A magnitude 4.8 earthquake was recorded 85 km W of Petrolia, CA on Aug 29, 2026, 2:41:11 AM (2026-08-29T02:41:11.610Z). The earthquake occurred at a depth of 10.0 km with coordinates 40.4500, -125.2723.
Measured data
- Magnitude
- M4.8 (mw)
- Exact location
- 85 km W of Petrolia, CA
- Country / region
- California, United States
- Date and time
- Aug 29, 2026, 2:41:11 AM (2026-08-29T02:41:11.610Z)
- Depth
- 10.0 km (shallow)
- Coordinates
- 40.4500 latitude, -125.2723 longitude
- USGS significance score
- 354
- Status
- reviewed-by-source
Earthquake data at a glance
M4.8 · 10.0 km deep · 385 km NW of Sacramento, United States
Magnitude 4.8 (mw) was reported for this earthquake.
Reported depth: 10.0 km (shallow, 0–70 km).
The epicentre was 385 km NW of Sacramento, United States.
USGS significance score: 354. USGS calculates this number from magnitude, maximum intensity, felt reports and estimated impact; it is not a risk rating.
No felt reports or intensity data have been published for this event.
General information: magnitude measures the energy released at the source on a logarithmic scale — each whole number is roughly 32 times more energy. Depth is how far below the surface the rupture began. Whether an earthquake is felt, and how strongly, depends on many factors and is best shown by felt reports and intensity data.
Regional background: California
General information about earthquakes in this region. It is not a measurement or assessment of this earthquake.
Most of California sits on the boundary between the Pacific and North American plates, which slide horizontally past each other. The San Andreas Fault is the best-known part of this boundary, but the motion is shared across a wide system of faults, including the Hayward and Calaveras faults in the San Francisco Bay Area and the San Jacinto and Elsinore faults in Southern California.
Most California earthquakes are shallow, typically less than about 20 km deep, because the crust on the plate boundary is relatively thin and warm. That is why moderate earthquakes can be felt strongly near the epicentre. Deeper events are found mainly in the far north, where the Gorda plate subducts beneath North America.
Official monitoring: USGS Earthquake Hazards Program, California Integrated Seismic Network.
Location
The epicentre was located at 40.4500 latitude and -125.2723 longitude, 85 km W of Petrolia, CA. The earthquake was shallow at 10.0 km depth.
More earthquakes in California
Other significant earthquakes in California
Data Source
Measurements on this page are published by USGS: official USGS event page. Earthquake Trackers combines reports from the USGS, GeoNet, BMKG and the British Geological Survey (BGS).
Data sources: USGS, GeoNet, BMKG and the British Geological Survey (BGS). The interactive map loads with JavaScript.