California earthquakes

M2.1 earthquake 12 km WSW of Round Valley, California

A magnitude 2.1 earthquake struck 12 km WSW of Round Valley, California on Mon, Mar 11, 1985, 1:46 PM PST (21:46 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M5.1 4 km NNW of Round Valley, California. This one was a foreshock.

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

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The earthquake

Magnitude
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1985-03-11 21:46:43 UTC
Depth
3.7 km (2.3 mi), shallow
Epicenter
37.380° N, 118.721° 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 1.1 km horizontally, 0.6 km in depth
Depth from
From location
Station coverage gap
197°, poorly surrounded by stations
Stations used
15

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 129 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 nc1126539 (also filed as ci62453). Read Thu, Oct 1, 2026, 8:38 PM UTC.