M2.7 earthquake 56 km NNE of Kobuk, Alaska

A magnitude 2.7 earthquake struck 56 km NNE of Kobuk, Alaska on Mon, Dec 20, 2021, 12:42 AM AKST (09:42 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M3.1 56 km NE of Kobuk, 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
2.7	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.045 · 66 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: 33 in the 60 days after this one and 15 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak021g9luv7d (also filed as us6000gdss). Read Thu, Oct 1, 2026, 8:50 PM UTC.