California earthquakes

M1.8 earthquake 19km NW of Grapevine, CA

A magnitude 1.8 earthquake struck 19km NW of Grapevine, CA on Mon, Aug 13, 1979, 6:59 AM PDT (13:59 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.2 10km NNW of Santa Barbara, 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
1.8 (mh), micro
Local time
UTC
1979-08-13 13:59:47 UTC
Depth
6.0 km (3.7 mi), shallow
Epicenter
35.072° N, 119.068° 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 0.6 km horizontally, 15.3 km in depth
Depth from
From location
Station coverage gap
102°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 53 in the 60 days after this one and 24 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3350849. Read Tue, Sep 29, 2026, 12:14 PM UTC.