California earthquakes

M2.4 earthquake 20 km NNE of Mesa, California

A magnitude 2.4 earthquake struck 20 km NNE of Mesa, California on Thu, Apr 2, 1987, 9:45 AM PST (17:45 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.2 3 km S of Mammoth Lakes, 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
2.4 (md), micro
Local time
UTC
1987-04-02 17:45:13 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
37.578° N, 118.426° 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, 0.5 km in depth
Magnitude uncertainty
±0.24
Depth from
From location
Station coverage gap
55°
Stations used
44

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 194 in the 60 days after this one and 112 in the 30 days before it.

After

The first 60 of 194.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc97870. Read Tue, Sep 29, 2026, 11:08 AM UTC.