M4.0 earthquake 299 km SW of Adak, Alaska

A magnitude 4.0 earthquake struck 299 km SW of Adak, Alaska on Fri, Mar 22, 2024, 1:36 AM GMT-12 (13:36 UTC), 10 km (6 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
4.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.15 · 12 stations
3.9	ML, local (Richter)	Alaska Earthquake Center	Preliminary

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 5 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000mkkt (also filed as ak0243ru0v8f). Read Fri, Oct 2, 2026, 1:56 PM UTC.