California earthquakes

M2.8 earthquake 0km ESE of Lake Davis, CA

A magnitude 2.8 earthquake struck 0km ESE of Lake Davis, CA on Sun, May 23, 2021, 2:18 AM PDT (09:18 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M4.2 10km SE of Dollar Point, 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: 2.8 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Sun, May 23, 2021, 2:18 AM PDT
UTC: 2021-05-23 09:18:24 UTC
Depth: 4.5 km (2.8 mi), shallow
Epicenter: 39.867° N, 120.468° W
Region: California
Felt reports: 5
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
2.77	Md, duration	Northern California Seismic System	Preferred · Final · ±0.086 · 5 stations
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.115 · 10 stations
2.7	ML, local (Richter)	Nevada Seismological Laboratory	Reviewed · ±0.37 · 3 stations

Did you feel it?

5 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.3 km horizontally, 0.8 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 113°
Stations used: 8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 59 in the 60 days after this one and 56 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc71123209 (also filed as us7000e5hf, nn00807889). Read Sat, Oct 3, 2026, 10:36 AM UTC.