M2.7 earthquake 83 km SSE of Adak, Alaska

A magnitude 2.7 earthquake struck 83 km SSE of Adak, Alaska on Fri, Dec 19, 2025, 3:31 AM HAST (13:31 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.3 39 km E 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
2.8	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.3 · 19 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 135 in the 60 days after this one and 67 in the 30 days before it.

The first 60 of 135.

From the USGS Earthquake Hazards Program and its partner networks, event us6000s9bg (also filed as ak2025yxenar). Read Fri, Oct 2, 2026, 6:32 AM UTC.