California earthquakes

M2.4 earthquake 9 km SSW of Trinity Center, California

A magnitude 2.4 earthquake struck 9 km SSW of Trinity Center, California on Tue, Sep 22, 1987, 10:07 AM PDT (17:07 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.9 14 km E of Blue Lake, 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: 2.4 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Tue, Sep 22, 1987, 10:07 AM PDT
UTC: 1987-09-22 17:07:08 UTC
Depth: 3.8 km (2.4 mi), shallow
Epicenter: 40.898° N, 122.724° 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 2.3 km horizontally, 8.2 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 159°
Stations used: 4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 26 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 nc10085214. Read Sun, Oct 4, 2026, 10:21 AM UTC.