California earthquakes

M3.1 earthquake 17 km ENE of Swall Meadows, California

A magnitude 3.1 earthquake struck 17 km ENE of Swall Meadows, California on Sun, Mar 8, 1987, 9:32 PM PST (05:32 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.4 11 km SW of Aspen Springs, 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: 3.1 (md), minor
Local time: Sun, Mar 8, 1987, 9:32 PM PST
UTC: 1987-03-09 05:32:38 UTC
Depth: 7.1 km (4.4 mi), shallow
Epicenter: 37.586° N, 118.472° 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, 0.6 km in depth
Magnitude uncertainty: ±0.26
Depth from: From location
Station coverage gap: 47°
Stations used: 44

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 194 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 194.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc96321 (also filed as ci718525, usp0003349). Read Tue, Sep 22, 2026, 4:03 PM UTC.