California earthquakes

M2.0 earthquake 5 km SSW of Swall Meadows, California

A magnitude 2.0 earthquake struck 5 km SSW of Swall Meadows, California on Mon, Dec 17, 1984, 11:48 PM PST (07:48 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M5.2 31 km ENE of Mono City, 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: 2.0 (Md, duration), micro
Magnitude from: Northern California Seismic System
Local time: Mon, Dec 17, 1984, 11:48 PM PST
UTC: 1984-12-18 07:48:00 UTC
Depth: 4.8 km (3.0 mi), shallow
Epicenter: 37.464° N, 118.664° 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 0.2 km horizontally, 0.6 km in depth
Magnitude uncertainty: ±0.25
Depth from: From location
Station coverage gap: 60°
Stations used: 40

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 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc34878 (also filed as ci56908). Read Thu, Oct 1, 2026, 6:46 AM UTC.