California earthquakes

M2.5 earthquake 1 km NNW of Mesa, California

A magnitude 2.5 earthquake struck 1 km NNW of Mesa, California on Sun, May 19, 1985, 3:15 AM PDT (10:15 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.3 4 km SE of Swall Meadows, California. 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
2.5 (md), micro
Local time
UTC
1985-05-19 10:15:25 UTC
Depth
9.7 km (6.0 mi), shallow
Epicenter
37.430° N, 118.548° 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, 0.7 km in depth
Magnitude uncertainty
±0.25
Depth from
From location
Station coverage gap
52°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 195 in the 60 days after this one and 4 in the 30 days before it.

After

The first 60 of 195.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc48032 (also filed as ci66739). Read Tue, Sep 22, 2026, 3:50 PM UTC.