M2.1 earthquake 5 km NNE of Mesa, California

A magnitude 2.1 earthquake struck 5 km NNE of Mesa, California on Wed, Oct 25, 2017, 4:33 AM PDT (11:33 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M3.8 12km W of Toms Place, 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
2.15	Md, duration	Northern California Seismic System	Preferred · Final · ±0.23 · 26 stations
1.8	ML, local (Richter)	Nevada Seismological Laboratory	Reviewed · ±0.47 · 7 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 177 in the 60 days after this one and 170 in the 30 days before it.

The first 60 of 177.

From the USGS Earthquake Hazards Program and its partner networks, event nc72913741 (also filed as nn00610479). Read Mon, Oct 5, 2026, 2:06 AM UTC.