California earthquakes

M1.8 earthquake 10km E of Buttonwillow, CA

A magnitude 1.8 earthquake struck 10km E of Buttonwillow, CA on Sat, May 16, 1987, 1:25 AM PDT (08:25 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.0 16km WNW of Grapevine, CA. This one was a foreshock.

Buttonwillow forecastMore in California

Map

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

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The earthquake

Magnitude
1.8 (mc), micro
Local time
UTC
1987-05-16 08:25:19 UTC
Depth
4.7 km (2.9 mi), shallow
Epicenter
35.404° N, 119.354° 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.

Depth from
Operator assigned
Station coverage gap
158°
Stations used
0

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 53 in the 60 days after this one and 13 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci722203. Read Mon, Sep 28, 2026, 12:19 PM UTC.