M2.3 earthquake 19 km SSE of Ruth, California

A magnitude 2.3 earthquake struck 19 km SSE of Ruth, California on Mon, Jul 3, 1978, 9:52 PM PDT (04:52 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.5 6 km SSW of Scotia, California. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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: 65 in the 60 days after this one and 34 in the 30 days before it.

The first 60 of 65.

From the USGS Earthquake Hazards Program and its partner networks, event nc1040908. Read Tue, Sep 22, 2026, 9:19 PM UTC.