M1.9 earthquake 10 km NE of Avenal, California

A magnitude 1.9 earthquake struck 10 km NE of Avenal, California on Thu, Aug 21, 1986, 8:55 PM PDT (03:55 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.4 15 km NW of Coalinga, California. 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
1.94	Md, duration	Northern California Seismic System	Preferred · Final · ±0.13 · 16 stations
2.27	Mc	Southern California Seismic Network	Final · 13 stations

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: 83 in the 60 days after this one and 37 in the 30 days before it.

The first 60 of 83.

From the USGS Earthquake Hazards Program and its partner networks, event nc79866 (also filed as ci707620). Read Fri, Oct 2, 2026, 5:36 AM UTC.