M1.9 earthquake 4km NNW of Orange, CA

A magnitude 1.9 earthquake struck 4km NNW of Orange, CA on Thu, Dec 31, 2020, 5:35 PM PST (01:35 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.5 2km W of Willowbrook, CA. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

8 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 80 in the 60 days after this one and 50 in the 30 days before it.

The first 60 of 80.

From the USGS Earthquake Hazards Program and its partner networks, event ci39508367. Read Sun, Oct 4, 2026, 12:38 PM UTC.