M3.1 earthquake 17 km S of Tyonek, Alaska

A magnitude 3.1 earthquake struck 17 km S of Tyonek, Alaska on Thu, Nov 12, 2020, 8:50 AM AKST (17:50 UTC), 66 km (41 mi) below the surface.

A larger quake followed: M3.5 14 km SSW of Willow, Alaska. 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
3.1	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.3	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.026 · 190 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: at least 201 in the 60 days after this one and 194 in the 30 days before it.

The first 60 of at least 201.

From the USGS Earthquake Hazards Program and its partner networks, event ak020ekjs6k2 (also filed as us7000cdxa). Read Fri, Oct 2, 2026, 3:03 AM UTC.