M2.5 earthquake 20km SE of Livermore, CA

A magnitude 2.5 earthquake struck 20km SE of Livermore, CA on Wed, Jun 23, 2021, 5:31 AM PDT (12:31 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.9 3km N of San Lorenzo, CA. This one was a foreshock.

Map

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

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.48	Md, duration	Northern California Seismic System	Preferred · Final · ±0.123 · 109 stations
2.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.055 · 43 stations

8 people reported to the USGS what they felt; the strongest reported shaking was IV, light 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: 72 in the 60 days after this one and 47 in the 30 days before it.

The first 60 of 72.

From the USGS Earthquake Hazards Program and its partner networks, event nc73578481 (also filed as us7000efg4). Read Sun, Oct 4, 2026, 1:57 AM UTC.