M4.6 earthquake 173 km WNW of Adak, Alaska

A magnitude 4.6 earthquake struck 173 km WNW of Adak, Alaska on Mon, Sep 16, 2024, 9:13 AM HADT (18:13 UTC), 249 km (155 mi) below the surface.

A larger quake followed: M4.7 134 km W 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
4.6	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.046 · 141 stations
4.6	mb, body-wave	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 1.6 and up: 19 in the 60 days after this one and 16 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us7000neam (also filed as ak024byaittb). Read Mon, Oct 5, 2026, 4:01 AM UTC.