M2.3 earthquake 6km SSW of Gilroy, CA

A magnitude 2.3 earthquake struck 6km SSW of Gilroy, CA on Sat, Oct 23, 2021, 9:28 AM PDT (16:28 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.9 1km NE of San Ramon, CA. This one was a foreshock.

Map

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

2 people 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: 130 in the 60 days after this one and 62 in the 30 days before it.

The first 60 of 130.

From the USGS Earthquake Hazards Program and its partner networks, event nc73643550. Read Sat, Oct 3, 2026, 11:22 PM UTC.