California earthquakes

M3.7 earthquake 11 km NE of Phillipsville, California

A magnitude 3.7 earthquake struck 11 km NE of Phillipsville, California on Mon, Jul 11, 1977, 10:17 PM PDT (05:17 UTC), 32 km (20 mi) below the surface.

A larger quake followed: M3.9 49 km WSW of Ferndale, 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: 3.7 (ml), minor
Local time: Mon, Jul 11, 1977, 10:17 PM PDT
UTC: 1977-07-12 05:17:10 UTC
Depth: 32.3 km (20.1 mi), shallow
Epicenter: 40.284° N, 123.694° 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 1.7 km horizontally, 1.5 km in depth
Depth from: From location
Station coverage gap: 204°, poorly surrounded by stations
Stations used: 17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 101 in the 60 days after this one and 38 in the 30 days before it.

After

The first 60 of 101.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1035787 (also filed as usp0000ppr). Read Wed, Sep 23, 2026, 2:37 AM UTC.