M3.3 earthquake Central Alaska

A magnitude 3.3 earthquake struck in Central Alaska on Thu, Feb 20, 2020, 12:32 AM AKST (09:32 UTC), 24 km (15 mi) below the surface.

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
3.4	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · 22 stations

54 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 35 in the 60 days after this one and 17 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak0202chykke (also filed as us70007tgq). Read Thu, Oct 1, 2026, 2:49 PM UTC.