California earthquakes

M2.5 earthquake 2km S of Round Valley, CA

A magnitude 2.5 earthquake struck 2km S of Round Valley, CA on Tue, Apr 13, 2021, 2:36 AM PDT (09:36 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.4 14km WSW of Toms Place, CA. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 2.5 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Tue, Apr 13, 2021, 2:36 AM PDT
UTC: 2021-04-13 09:36:51 UTC
Depth: 12.8 km (7.9 mi), shallow
Epicenter: 37.396° N, 118.600° W
Region: California
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.46	Md, duration	Northern California Seismic System	Preferred · Final · ±0.201 · 39 stations
2.0	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.039 · 85 stations
2.2	ML, local (Richter)	Nevada Seismological Laboratory	Reviewed · ±0.49 · 12 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.4 km horizontally, 1.3 km in depth
Magnitude uncertainty: ±0.20
Depth from: From location
Station coverage gap: 61°
Stations used: 40

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: at least 201 in the 60 days after this one and 117 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73548895 (also filed as nn00804942, us6000e16g). Read Sun, Oct 4, 2026, 6:41 AM UTC.