M3.0 earthquake 5 km S of Point MacKenzie, Alaska

A magnitude 3.0 earthquake struck 5 km S of Point MacKenzie, Alaska on Thu, Dec 24, 2020, 1:21 PM AKST (22:21 UTC), 38 km (24 mi) below the surface.

A larger quake followed: M3.6 17 km ESE of Susitna North, 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
3.0	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.2	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.028 · 172 stations

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

18 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: 196 in the 60 days after this one and 157 in the 30 days before it.

The first 60 of 196.

From the USGS Earthquake Hazards Program and its partner networks, event ak020gi35olq (also filed as us6000d2qk). Read Thu, Oct 1, 2026, 1:10 PM UTC.