M3.1 earthquake 19 km SW of Tyonek, Alaska

A magnitude 3.1 earthquake struck 19 km SW of Tyonek, Alaska on Thu, Oct 15, 2020, 6:34 PM AKDT (02:34 UTC), 69 km (43 mi) below the surface.

A larger quake followed: M3.5 22 km E of Point Possession, 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 · ±0.025 · 216 stations

1 person 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: at least 202 in the 60 days after this one and 138 in the 30 days before it.

The first 60 of at least 202.

From the USGS Earthquake Hazards Program and its partner networks, event ak020dbn8x0e (also filed as us6000c8n7). Read Sat, Oct 3, 2026, 2:15 AM UTC.