California earthquakes

M1.7 earthquake 14km SE of Anza, CA

A magnitude 1.7 earthquake struck 14km SE of Anza, CA on Sun, Nov 19, 1978, 9:10 PM PST (05:10 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.3 12km SSW of Big Bear Lake, CA. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.7 (Mc), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
1978-11-20 05:10:08 UTC
Depth
7.7 km (4.8 mi), shallow
Epicenter
33.457° N, 116.579° 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, 2.6 km in depth
Depth from
From location
Station coverage gap
62°
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: 181 in the 60 days after this one and 125 in the 30 days before it.

After

The first 60 of 181.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3314005. Read Fri, Oct 2, 2026, 4:17 AM UTC.