California earthquakes

M2.3 earthquake 7 km SSE of Trinity Center, California

A magnitude 2.3 earthquake struck 7 km SSE of Trinity Center, California on Thu, Sep 19, 1985, 11:53 AM PDT (18:53 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M3.3 29 km SE of Ruth, 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: 2.3 (md), micro
Local time: Thu, Sep 19, 1985, 11:53 AM PDT
UTC: 1985-09-19 18:53:06 UTC
Depth: 4.0 km (2.5 mi), shallow
Epicenter: 40.920° N, 122.664° 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 10.6 km horizontally, 48.5 km in depth
Depth from: From location
Station coverage gap: 206°, poorly surrounded by stations
Stations used: 7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 20 in the 30 days before it.

After

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc56161. Read Tue, Sep 22, 2026, 9:28 PM UTC.