California earthquakes

M3.0 earthquake 35 km W of Big Lagoon, California

A magnitude 3.0 earthquake struck 35 km W of Big Lagoon, California on Sun, Mar 3, 1985, 6:55 PM PST (02:55 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M3.2 26 km NE of Willow Creek, California. This one was a foreshock.

Westhaven-Moonstone 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
3.0 (md), minor
Local time
UTC
1985-03-04 02:55:01 UTC
Depth
17.1 km (10.6 mi), shallow
Epicenter
41.139° N, 124.557° 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.

Location uncertainty
About 1.6 km horizontally, 1.5 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
231°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 45 in the 60 days after this one and 20 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc44357. Read Tue, Sep 22, 2026, 11:20 AM UTC.