California earthquakes

M1.9 earthquake 17km ESE of Anza, CA

A magnitude 1.9 earthquake struck 17km ESE of Anza, CA on Sat, Aug 13, 1983, 6:19 AM PDT (13:19 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.7 0km E of Loma Linda, 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
1.9 (Mh), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
1983-08-13 13:19:49 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
33.501° N, 116.498° 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 0.3 km horizontally, 31.6 km in depth
Magnitude uncertainty
±0.21
Depth from
Operator assigned
Station coverage gap
44°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 176 in the 60 days after this one and 100 in the 30 days before it.

After

The first 60 of 176.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci18655. Read Fri, Oct 2, 2026, 2:52 PM UTC.