M3.3 earthquake 73 km SW of Atka, Alaska

A magnitude 3.3 earthquake struck 73 km SW of Atka, Alaska on Mon, Apr 22, 2024, 3:45 AM HADT (12:45 UTC), 49 km (30 mi) below the surface.

A larger quake followed: M4.9 53 km E of Adak, 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)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.109 · 11 stations
2.8	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 84 in the 30 days before it.

The first 60 of 186.

From the USGS Earthquake Hazards Program and its partner networks, event us6000n059 (also filed as ak024573547n). Read Thu, Oct 1, 2026, 6:58 AM UTC.