M2.9 earthquake 10km NE of Milpitas, CA

A magnitude 2.9 earthquake struck 10km NE of Milpitas, CA on Tue, Sep 14, 2021, 11:45 AM PDT (18:45 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.4 3km N of San Leandro, 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
2.93	Md, duration	Northern California Seismic System	Preferred · Final · ±0.141 · 145 stations
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.034 · 116 stations

139 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: 85 in the 60 days after this one and 28 in the 30 days before it.

The first 60 of 85.

From the USGS Earthquake Hazards Program and its partner networks, event nc73624816 (also filed as us7000fb54). Read Sun, Oct 4, 2026, 7:58 PM UTC.