M3.3 earthquake 67 km S of Cantwell, Alaska

A magnitude 3.3 earthquake struck 67 km S of Cantwell, Alaska on Wed, Dec 9, 2020, 11:01 PM AKST (08:01 UTC), 76 km (47 mi) below the surface.

A larger quake followed: M3.7 41 km NNE of Petersville, 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
3.3	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.8	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.293 · 3 stations

2 people reported to the USGS what they felt; the strongest reported shaking was III, weak 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: 170 in the 60 days after this one and 67 in the 30 days before it.

The first 60 of 170.

From the USGS Earthquake Hazards Program and its partner networks, event ak020fup6f21 (also filed as us7000cppe). Read Sun, Oct 4, 2026, 6:42 AM UTC.