M2.5 earthquake 27km SSE of Somes Bar, CA

A magnitude 2.5 earthquake struck 27km SSE of Somes Bar, CA on Sun, Jun 13, 2021, 7:08 PM PDT (02:08 UTC), 39 km (24 mi) below the surface.

A larger quake followed: M2.5 19km SE of Bayside, 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
2.5	Md, duration	Northern California Seismic System	Preferred · Final · ±0.13 · 27 stations
1.9	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.062 · 34 stations

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 9 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event nc73574161 (also filed as us7000ecub). Read Sun, Oct 4, 2026, 10:22 AM UTC.