M1.8 earthquake 4 km NNW of Aromas, California

A magnitude 1.8 earthquake struck 4 km NNW of Aromas, California on Wed, Oct 18, 1989, 12:34 PM PDT (19:34 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.7 4 km NW of Day Valley, 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: at least 202 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of at least 202.

From the USGS Earthquake Hazards Program and its partner networks, event nc20091264. Read Mon, Oct 5, 2026, 6:38 AM UTC.