California earthquakes

M1.5 earthquake 19 km ENE of Swall Meadows, California

A magnitude 1.5 earthquake struck 19 km ENE of Swall Meadows, California on Fri, Jan 23, 1987, 3:18 AM PST (11:18 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M1.6 12 km WSW 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: 1.5 (md), micro
Local time: Fri, Jan 23, 1987, 3:18 AM PST
UTC: 1987-01-23 11:18:40 UTC
Depth: 7.1 km (4.4 mi), shallow
Epicenter: 37.582° N, 118.447° 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: ±0.23
Depth from: From location
Station coverage gap: 66°
Stations used: 27

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc93063. Read Tue, Sep 22, 2026, 10:00 AM UTC.