M3.4 earthquake 5 km SW of Ridgemark, CA

A magnitude 3.4 earthquake struck 5 km SW of Ridgemark, CA on Tue, Jun 23, 2026, 2:03 AM PDT (09:03 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M3.9 6 km NW of Pinnacles, 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
3.38	ML, local (Richter)	Northern California Seismic System	Preferred · Final · ±0.141 · 148 stations
3.3	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.029 · 152 stations

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

43 people reported to the USGS what they felt; the strongest reported shaking was V, moderate 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: 171 in the 60 days after this one and 42 in the 30 days before it.

The first 60 of 171.

From the USGS Earthquake Hazards Program and its partner networks, event nc75382001 (also filed as us6000t7ka). Read Thu, Oct 1, 2026, 2:10 PM UTC.