M2.3 earthquake 6km WSW of Colma, CA

A magnitude 2.3 earthquake struck 6km WSW of Colma, CA on Mon, Apr 19, 2021, 7:54 AM PDT (14:54 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M3.6 15km N of Morgan Hill, CA. This one was a foreshock.

Map

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

13 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: 65 in the 60 days after this one and 22 in the 30 days before it.

The first 60 of 65.

From the USGS Earthquake Hazards Program and its partner networks, event nc73551490. Read Sat, Oct 3, 2026, 4:53 PM UTC.