M2.7 earthquake 7km NNW of Cholame, CA

A magnitude 2.7 earthquake struck 7km NNW of Cholame, CA on Sat, Jul 31, 2021, 12:09 PM PDT (19:09 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M3.8 15km SSE of New Idria, 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
2.73	Md, duration	Northern California Seismic System	Preferred · Final · ±0.145 · 61 stations
2.4	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.06 · 36 stations

3 people 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: 51 in the 60 days after this one and 17 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event nc73603486 (also filed as us6000f11e). Read Sun, Oct 4, 2026, 4:42 PM UTC.