California earthquakes

M1.5 earthquake 7 km SSW of Mad River, California

A magnitude 1.5 earthquake struck 7 km SSW of Mad River, California on Fri, May 22, 1981, 2:15 AM PDT (09:15 UTC), 27 km (17 mi) below the surface.

A larger quake followed: M4.6 23 km WSW of Weott, 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
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1981-05-22 09:15:41 UTC
Depth
26.9 km (16.7 mi), shallow
Epicenter
40.392° N, 123.538° 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 3.1 km horizontally, 1.4 km in depth
Depth from
From location
Station coverage gap
273°, poorly surrounded by stations
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 161 in the 60 days after this one and 69 in the 30 days before it.

After

The first 60 of 161.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1063897. Read Sat, Oct 3, 2026, 9:20 AM UTC.