California earthquakes

M1.7 earthquake 3km NE of Placentia, CA

A magnitude 1.7 earthquake struck 3km NE of Placentia, CA on Wed, Jun 23, 2021, 11:51 PM PDT (06:51 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.4 4km NNW of Fontana, 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
1.7 (ML, local (Richter)), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
2021-06-24 06:51:30 UTC
Depth
5.2 km (3.2 mi), shallow
Epicenter
33.893° N, 117.850° 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 0.2 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
53°
Stations used
69

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 71 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 71.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci39717127. Read Sat, Oct 3, 2026, 11:36 PM UTC.