California earthquakes

M1.9 earthquake 22 km NW of Parkfield, California

A magnitude 1.9 earthquake struck 22 km NW of Parkfield, California on Wed, Aug 19, 1981, 10:38 PM PDT (05:38 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M3.3 13 km S of Tres Pinos, 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
1.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1981-08-20 05:38:52 UTC
Depth
-0.6 km (-0.4 mi), shallow
Epicenter
36.040° N, 120.608° 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, 1.5 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
51°
Stations used
25

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 102 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 102.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1066950. Read Thu, Oct 1, 2026, 7:07 PM UTC.