M3.4 earthquake 16 km ENE of Georgetown, Idaho

A magnitude 3.4 earthquake struck 16 km ENE of Georgetown, Idaho on Wed, Oct 20, 2021, 8:38 PM MDT (02:38 UTC), 5 km (3 mi) below the surface.

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
3.4	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.03 · 142 stations
3.37	ML, local (Richter)	University of Utah Seismograph Stations	Final · ±0.124 · 26 stations

23 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: 15 in the 60 days after this one and 4 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000fwbi (also filed as uu60464072). Read Sat, Oct 3, 2026, 11:20 PM UTC.