M1.7 earthquake 2km SE of Simi Valley, CA

A magnitude 1.7 earthquake struck 2km SE of Simi Valley, CA on Fri, Oct 22, 2021, 9:17 AM PDT (16:17 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M3.6 3km WSW of East Los Angeles, CA. This one was a foreshock.

Map

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

1 person reported to the USGS what they felt; the strongest reported shaking was II, 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: 59 in the 60 days after this one and 27 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ci39840287. Read Mon, Oct 5, 2026, 4:15 AM UTC.