M3.1 earthquake 18 km SE of Walker, California

A magnitude 3.1 earthquake struck 18 km SE of Walker, California on Fri, Oct 26, 1990, 4:02 AM PDT (11:02 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.3 0 km N of Mono City, California. This one was a foreshock.

Map

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

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
3.1	ML, local (Richter)	Northern California Seismic System	Preferred · Final · 0 stations
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 124 in the 60 days after this one and 101 in the 30 days before it.

The first 60 of 124.

From the USGS Earthquake Hazards Program and its partner networks, event nc202354 (also filed as usp0004g6e). Read Mon, Oct 5, 2026, 2:02 AM UTC.