California earthquakes

M3.7 earthquake 2km NW of Willowbrook, CA

A magnitude 3.7 earthquake struck 2km NW of Willowbrook, CA on Tue, Mar 1, 1983, 12:18 PM PST (20:18 UTC), 5 km (3 mi) below the surface.

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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: 3.7 (ML, local (Richter)), minor
Magnitude from: Southern California Seismic Network
Local time: Tue, Mar 1, 1983, 12:18 PM PST
UTC: 1983-03-01 20:18:35 UTC
Depth: 4.7 km (2.9 mi), shallow
Epicenter: 33.931° N, 118.272° W
Region: California
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.72	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.212 · 11 stations
3.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

What happened

The USGS’s account of the effects of this earthquake.

Felt (V) at Malibu and (IV) at Lawndale, Lomita, Redondo Beach, Torrance and Wilmington. Also felt at Cerritos, Downey, Gardena, Hermosa Beach, Long Beach, Palos Verdes Peninsula, South Gate and Van Nuys.

From the USGS event page for ci1102237. U.S. Geological Survey text and figures are in the public domain.

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 0.5 km horizontally, 2.8 km in depth
Magnitude uncertainty: ±0.21
Depth from: From location
Station coverage gap: 53°
Stations used: 66

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 86 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 86.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci1102237 (also filed as usp0001tdk). Read Thu, Oct 1, 2026, 1:15 PM UTC.