California earthquakes

M1.5 earthquake 27km W of Round Valley, CA

A magnitude 1.5 earthquake struck 27km W of Round Valley, CA on Thu, Sep 16, 2021, 10:43 PM PDT (05:43 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M3.7 13km SSE of Bodie, 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
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-09-17 05:43:09 UTC
Depth
4.2 km (2.6 mi), shallow
Epicenter
37.397° N, 118.898° W
Tsunami flag
No
Status
Reviewed by a seismologist

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, 3.6 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
120°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 137 in the 60 days after this one and 45 in the 30 days before it.

After

The first 60 of 137.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73625836. Read Sat, Oct 3, 2026, 5:02 PM UTC.