M2.5 earthquake 16km SSE of Somes Bar, CA

A magnitude 2.5 earthquake struck 16km SSE of Somes Bar, CA on Fri, Nov 12, 2021, 3:45 AM PST (11:45 UTC), 38 km (24 mi) below the surface.

A larger quake followed: M2.9 29km ENE of Willow Creek, CA. 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
2.51	Md, duration	Northern California Seismic System	Preferred · Final · ±0.178 · 32 stations
1.8	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.061 · 35 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: 12 in the 60 days after this one and 3 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event nc73651875 (also filed as us7000ftiu). Read Sun, Oct 4, 2026, 2:55 PM UTC.