California earthquakes

M2.2 earthquake 2km SSW of Fontana, CA

A magnitude 2.2 earthquake struck 2km SSW of Fontana, CA on Wed, May 30, 1973, 12:53 PM PDT (19:53 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.5 11km E of Lucerne Valley, 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
2.2 (ML, local (Richter)), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
1973-05-30 19:53:45 UTC
Depth
9.8 km (6.1 mi), shallow
Epicenter
34.084° N, 117.466° 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 1.0 km horizontally, 1.7 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
123°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 107.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3320021. Read Fri, Oct 2, 2026, 10:50 PM UTC.