California earthquakes

M1.7 earthquake 19 km ENE of Swall Meadows, California

A magnitude 1.7 earthquake struck 19 km ENE of Swall Meadows, California on Sun, Aug 23, 1987, 4:58 PM PDT (23:58 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.5 24 km E of Fish Camp, 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), micro
Local time: Sun, Aug 23, 1987, 4:58 PM PDT
UTC: 1987-08-23 23:58:20 UTC
Depth: 5.3 km (3.3 mi), shallow
Epicenter: 37.576° N, 118.443° 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, 0.9 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 60°
Stations used: 13

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 199 in the 60 days after this one and 128 in the 30 days before it.

After

The first 60 of at least 199.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1152182. Read Sun, Sep 27, 2026, 8:08 AM UTC.