California earthquakes

M1.7 earthquake 5 km SSW of Swall Meadows, California

A magnitude 1.7 earthquake struck 5 km SSW of Swall Meadows, California on Sun, Mar 10, 1985, 11:25 PM PST (07:25 UTC), 3 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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Map

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

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The earthquake

Magnitude: 1.7 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Sun, Mar 10, 1985, 11:25 PM PST
UTC: 1985-03-11 07:25:40 UTC
Depth: 2.8 km (1.7 mi), shallow
Epicenter: 37.456° N, 118.656° W
Region: California
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 0.2 km horizontally, 0.4 km in depth
Magnitude uncertainty: ±0.29
Depth from: From location
Station coverage gap: 61°
Stations used: 35

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 nc43499. Read Fri, Oct 2, 2026, 10:25 AM UTC.