M2.7 earthquake 57 km SSW of Adak, Alaska

A magnitude 2.7 earthquake struck 57 km SSW of Adak, Alaska on Sun, Oct 5, 2025, 8:35 AM HADT (17:35 UTC), 34 km (21 mi) below the surface.

A larger quake followed: M5.5 67 km SSW 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
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.105 · 12 stations
2.32	ML, local (Richter)	AV	Final · ±0.2039231994634 · 11 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 67 in the 60 days after this one and 16 in the 30 days before it.

The first 60 of 67.

From the USGS Earthquake Hazards Program and its partner networks, event us6000rf07 (also filed as av93806823). Read Fri, Oct 2, 2026, 12:17 PM UTC.