California earthquakes

M1.6 earthquake 9 km NE of Phillipsville, California

A magnitude 1.6 earthquake struck 9 km NE of Phillipsville, California on Tue, Jun 28, 1983, 1:07 AM PDT (08:07 UTC), 30 km (19 mi) below the surface.

A larger quake followed: M1.8 20 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: 1.6 (md), micro
Local time: Tue, Jun 28, 1983, 1:07 AM PDT
UTC: 1983-06-28 08:07:18 UTC
Depth: 29.9 km (18.6 mi), shallow
Epicenter: 40.278° N, 123.714° 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 0.6 km horizontally, 1.3 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 112°
Stations used: 15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1097665. Read Thu, Sep 24, 2026, 4:51 AM UTC.