California earthquakes

M1.5 earthquake 21 km W of Trinity Center, California

A magnitude 1.5 earthquake struck 21 km W of Trinity Center, California on Sun, Nov 3, 1985, 8:07 PM PST (04:07 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M3.7 8 km NNW of Alderpoint, 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: Sun, Nov 3, 1985, 8:07 PM PST
UTC: 1985-11-04 04:07:37 UTC
Depth: 19.6 km (12.2 mi), shallow
Epicenter: 40.957° N, 122.948° 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 6.6 km horizontally, 5.0 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 300°, poorly surrounded by stations
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: 31 in the 60 days after this one and 10 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc59053. Read Tue, Sep 29, 2026, 1:56 PM UTC.