M2.5 earthquake 2km W of Round Valley, CA

A magnitude 2.5 earthquake struck 2km W of Round Valley, CA on Wed, Sep 15, 2021, 8:23 PM PDT (03:23 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.7 30 km SSE of Mina, Nevada. 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
2.55	Md, duration	Northern California Seismic System	Preferred · Final · ±0.156 · 30 stations
2.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.044 · 68 stations

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: 169 in the 60 days after this one and 62 in the 30 days before it.

The first 60 of 169.

From the USGS Earthquake Hazards Program and its partner networks, event nc73625391 (also filed as us7000fbp5). Read Sat, Oct 3, 2026, 3:18 PM UTC.