California earthquakes

M1.8 earthquake 10 km ESE of Mammoth Lakes, California

A magnitude 1.8 earthquake struck 10 km ESE of Mammoth Lakes, California on Fri, Aug 20, 1982, 11:07 PM PDT (06:07 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M5.0 21 km NNW of Dyer, Nevada. This one was a foreshock.

Mammoth Lakes forecast More in California

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 1.8 (md), micro
Local time: Fri, Aug 20, 1982, 11:07 PM PDT
UTC: 1982-08-21 06:07:19 UTC
Depth: 3.5 km (2.2 mi), shallow
Epicenter: 37.613° N, 118.858° 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 0.4 km horizontally, 0.8 km in depth
Magnitude uncertainty: ±0.34
Depth from: From location
Station coverage gap: 104°
Stations used: 13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 202 in the 60 days after this one and 198 in the 30 days before it.

After

The first 60 of at least 202.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1077821. Read Wed, Sep 30, 2026, 8:38 PM UTC.