California earthquakes

M5.1 earthquake 6km N of Grapevine, CA

A magnitude 5.1 earthquake struck 6km N of Grapevine, CA on Wed, Jul 23, 1952, 11:13 AM GMT-7 (18:13 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M5.5 22km N of Tehachapi, 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
5.1 (ml), moderate
Local time
UTC
1952-07-23 18:13:50 UTC
Depth
15.2 km (9.5 mi), shallow
Epicenter
34.996° N, 118.930° W
Strongest shaking
VI, strong shaking
Tsunami flag
No
Status
Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
VI, strong shaking
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

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 1.1 km horizontally, 2.4 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
88°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 2.1 and up: 177 in the 60 days after this one and 21 in the 30 days before it.

After

The first 60 of 177.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3318277 (also filed as ushis1832). Read Tue, Sep 22, 2026, 12:15 PM UTC.