2.3

M2.3 Earthquake 34 km WNW of Petrolia, CA — July 28, 2026

2026-07-28 09:35:08 UTC (2026-07-28) · approx. 1:35 AM UTC-8 local

MagnitudeM2.3(md)
Time09:35 UTC≈ 1:35 AM UTC-8
Depth17.7 kmshallow crustal
Coordinates40.462°, -124.646°
Felt byNo felt reports
Status✓ Reviewed by USGS
Map showing earthquake epicenter at 40.46°, -124.65°

Earthquake Details

Magnitude
2.3 md
Depth
17.7 km
shallow crustal
Location
40.4620°N
-124.6460°E

Technical Information

Event ID
nc75407192
Event Type
earthquake
Status
✓ Reviewed
Significance
80
Stations Used
35
Azimuthal Gap
272.0°
Min Station Distance
0.236°
RMS Residual
0.18 sec
Last Updated
2026-08-06 22:57:21 UTC

Nearby Earthquakes (Last 7 Days)

2.5
1 km N of The Geysers, CA
9 hours ago · 0.5 km deep
3.1
10 km WNW of Cobb, CA
11 hours ago · 3.9 km deep
3.0
10 km WNW of Cobb, CA
11 hours ago · 5.1 km deep
2.5
2 km ESE of Oakland, CA
1 day ago · 10.3 km deep
3.6
21 km W of Petrolia, CA
1 day ago · 20.4 km deep
3.8
20 km WSW of Petrolia, CA
1 day ago · 20.3 km deep
2.7
12 km WNW of Cobb, CA
1 day ago · 0.5 km deep
2.6
11 km WNW of Cobb, CA
1 day ago · 1.2 km deep
3.7
36 km E of Hydesville, CA
3 days ago · 24.3 km deep
2.6
134 km W of Dunes City, Oregon
4 days ago · 10.0 km deep

Actions

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Understanding This Data

Magnitude 2.3 earthquakes are typically only recorded by instruments.

Learn more about magnitude →

Authoritative source: USGS event page (event ID: nc75407192). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2026, July 28, 2026). M2.3 Earthquake 34 km WNW of Petrolia, CA — July 28, 2026. Retrieved August 6, 2026 from https://www.earthquaketracker.org/earthquakes/event/nc75407192/