M2.9 earthquake 78 km SW of Adak, Alaska

A magnitude 2.9 earthquake struck 78 km SW of Adak, Alaska on Wed, Sep 18, 2024, 7:31 PM HADT (04:31 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.4 142 km WSW 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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 stations
2.6	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: at least 200 in the 60 days after this one and 118 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event us7000nn89 (also filed as ak024c30wp1e). Read Thu, Oct 1, 2026, 1:17 PM UTC.