M1.6 earthquake 128 km W of Adak, Alaska

A magnitude 1.6 earthquake struck 128 km W of Adak, Alaska on Thu, Jul 4, 2024, 7:25 AM HADT (16:25 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M3.7 166 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
1.6	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
1.71	ML, local (Richter)	AV	Final · ±0.154033798996823 · 7 stations

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 144 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak0248jvmw21 (also filed as av93186011). Read Thu, Oct 1, 2026, 1:49 PM UTC.