M1.7 earthquake 6km WSW of Corona, CA

A magnitude 1.7 earthquake struck 6km WSW of Corona, CA on Tue, May 28, 1985, 9:27 PM PDT (04:27 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M1.8 2km SSW of Loma Linda, 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: 161 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 161.

From the USGS Earthquake Hazards Program and its partner networks, event ci67304. Read Tue, Sep 22, 2026, 10:31 PM UTC.