M3.1 earthquake 24 km NNW of Cordova, Alaska

A magnitude 3.1 earthquake struck 24 km NNW of Cordova, Alaska on Tue, Sep 21, 2021, 2:12 PM AKDT (22:12 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.4 40 km SSW of Tatitlek, 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
3.1	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.3	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.03 · 143 stations

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt 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: 79 in the 60 days after this one and 32 in the 30 days before it.

The first 60 of 79.

From the USGS Earthquake Hazards Program and its partner networks, event ak021c4z1qub (also filed as us7000fd9e). Read Sun, Oct 4, 2026, 6:55 AM UTC.