M2.3 earthquake 38 km WNW of Augusta, Montana

A magnitude 2.3 earthquake struck 38 km WNW of Augusta, Montana on Sun, May 14, 2017, 11:33 PM MDT (05:33 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M5.8 11 km SE of Lincoln, Montana. 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
2.3	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.091 · 16 stations
2.5	ML, local (Richter)	Montana Bureau of Mines and Geology	Final · ±0.173 · 11 stations

1 person 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: 120 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 120.

From the USGS Earthquake Hazards Program and its partner networks, event us10008shz (also filed as mb80209194). Read Mon, Oct 5, 2026, 3:51 AM UTC.