M1.9 earthquake 166 km W of Adak, Alaska

A magnitude 1.9 earthquake struck 166 km W of Adak, Alaska on Thu, Jul 24, 2025, 11:29 AM HADT (20:29 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M5.9 237 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
1.9	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
1.7	ML, local (Richter)	AV	Final · ±0.313207002830621 · 13 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 153 in the 60 days after this one and 130 in the 30 days before it.

The first 60 of 153.

From the USGS Earthquake Hazards Program and its partner networks, event ak0259fd940f (also filed as av93686991). Read Fri, Oct 2, 2026, 3:09 PM UTC.