2.1

M2.1 Earthquake 5 km SW of Ridgemark, CA — December 21, 2025

2025-12-21 22:05:39 UTC (2025-12-21) · approx. 2:05 PM UTC-8 local

MagnitudeM2.1(md)
Time22:05 UTC≈ 2:05 PM UTC-8
Depth6.3 kmshallow crustal
Coordinates36.778°, -121.410°
Felt byNo felt reports
StatusAutomatic (preliminary)
Map showing earthquake epicenter at 36.78°, -121.41°

Earthquake Details

Magnitude
2.1 md
Depth
6.3 km
shallow crustal
Location
36.7785°N
-121.4103°E

Technical Information

Event ID
nc75284361
Event Type
earthquake
Status
Automatic
Significance
69
Stations Used
36
Azimuthal Gap
40.0°
Min Station Distance
0.033°
RMS Residual
0.16 sec
Last Updated
2025-12-21 22:08:52 UTC

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Actions

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Understanding This Data

Magnitude 2.1 earthquakes are typically only recorded by instruments.

Learn more about magnitude →

Authoritative source: USGS event page (event ID: nc75284361). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2025, December 21, 2025). M2.1 Earthquake 5 km SW of Ridgemark, CA — December 21, 2025. Retrieved December 21, 2025 from https://www.earthquaketracker.org/earthquakes/event/nc75284361/