M2.9 earthquake 11km SW of Ridgemark, CA

A magnitude 2.9 earthquake struck 11km SW of Ridgemark, CA on Mon, Jul 6, 2020, 3:55 PM PDT (22:55 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.9 22km NE of San Ardo, 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
2.88	ML, local (Richter)	Northern California Seismic System	Preferred · Final · ±0.16 · 51 stations
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.04 · 83 stations

27 people reported to the USGS what they felt; the strongest reported shaking was III, 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: 117 in the 60 days after this one and 66 in the 30 days before it.

The first 60 of 117.

From the USGS Earthquake Hazards Program and its partner networks, event nc73422696 (also filed as us7000aj3t). Read Sun, Oct 4, 2026, 2:39 PM UTC.