California earthquakes

M2.3 earthquake 19 km WSW of Three Rocks, California

A magnitude 2.3 earthquake struck 19 km WSW of Three Rocks, California on Mon, Oct 19, 1987, 1:13 PM PDT (20:13 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M4.0 21 km NNE of Soledad, California. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 2.3 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Mon, Oct 19, 1987, 1:13 PM PDT
UTC: 1987-10-19 20:13:26 UTC
Depth: 16.0 km (9.9 mi), shallow
Epicenter: 36.436° N, 120.597° W
Region: California
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 0.3 km horizontally, 0.6 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 152°
Stations used: 33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 140 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 140.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc107389. Read Fri, Oct 2, 2026, 10:21 PM UTC.