California earthquakes

M1.7 earthquake 2km SE of Palomar Observatory, CA

A magnitude 1.7 earthquake struck 2km SE of Palomar Observatory, CA on Sat, May 15, 2021, 1:00 PM PDT (20:00 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M3.6 4km NNW of Yucca 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
1.7 (ML, local (Richter)), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
2021-05-15 20:00:10 UTC
Depth
8.1 km (5.1 mi), shallow
Epicenter
33.344° N, 116.852° 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 0.1 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
29°
Stations used
73

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 119 in the 60 days after this one and 78 in the 30 days before it.

After

The first 60 of 119.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci39654591. Read Sun, Oct 4, 2026, 3:51 PM UTC.