M3.3 earthquake 42 km WNW of Ninilchik, Alaska

A magnitude 3.3 earthquake struck 42 km WNW of Ninilchik, Alaska on Mon, Sep 28, 2020, 1:28 AM AKDT (09:28 UTC), 91 km (57 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
3.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.029 · 156 stations

2 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: at least 199 in the 60 days after this one and 166 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event ak020chzpaur (also filed as us6000c241). Read Sun, Oct 4, 2026, 5:48 PM UTC.