M1.5 earthquake 2 km WSW of Mesa, California

A magnitude 1.5 earthquake struck 2 km WSW of Mesa, California on Sun, Aug 19, 1990, 9:15 PM PDT (04:15 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.6 2 km ESE of Round 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: 159 in the 60 days after this one and 54 in the 30 days before it.

The first 60 of 159.

From the USGS Earthquake Hazards Program and its partner networks, event nc162927. Read Sun, Oct 4, 2026, 7:07 PM UTC.