California earthquakes

M1.7 earthquake 3km WNW of Devore, CA

A magnitude 1.7 earthquake struck 3km WNW of Devore, CA on Fri, Sep 8, 1978, 11:08 AM PDT (18:08 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M1.7 2km ESE of Loma Linda, CA. 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
1.7 (mh), micro
Local time
UTC
1978-09-08 18:08:02 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
34.231° N, 117.434° 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 0.5 km horizontally, 23.8 km in depth
Depth from
From location
Station coverage gap
91°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 121 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 121.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3341668. Read Wed, Sep 23, 2026, 4:47 PM UTC.