M2.4 earthquake 2 km ESE of Big Lake, Alaska

A magnitude 2.4 earthquake struck 2 km ESE of Big Lake, Alaska on Mon, Oct 11, 2021, 3:33 AM AKDT (11:33 UTC), 48 km (30 mi) below the surface.

A larger quake followed: M3.6 24 km SSW 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
2.4	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.033 · 122 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 199 in the 60 days after this one and 107 in the 30 days before it.

The first 60 of 199.

From the USGS Earthquake Hazards Program and its partner networks, event ak021d1vdh80 (also filed as us6000ftpk). Read Thu, Oct 1, 2026, 8:31 PM UTC.