M1.8 earthquake 24km N of Tehachapi, CA

A magnitude 1.8 earthquake struck 24km N of Tehachapi, CA on Fri, Apr 20, 1984, 4:23 AM PST (12:23 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.0 17km NNW of Fillmore, CA. 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: 132 in the 60 days after this one and 162 in the 30 days before it.

The first 60 of 132.

From the USGS Earthquake Hazards Program and its partner networks, event ci37206. Read Mon, Sep 28, 2026, 10:04 PM UTC.