California earthquakes

M1.5 earthquake 5 km WNW of Dublin, California

A magnitude 1.5 earthquake struck 5 km WNW of Dublin, California on Sat, Sep 27, 1986, 3:42 PM PDT (22:42 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M4.2 1 km SSW of Diablo, 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
1.5 (md), micro
Local time
UTC
1986-09-27 22:42:15 UTC
Depth
14.7 km (9.1 mi), shallow
Epicenter
37.711° N, 121.992° 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 0.3 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
82°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 130 in the 60 days after this one and 35 in the 30 days before it.

After

The first 60 of 130.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc83976. Read Thu, Oct 1, 2026, 12:28 AM UTC.