Alaska earthquakes

M2.5 earthquake 213 km WSW of Adak, Alaska

A magnitude 2.5 earthquake struck 213 km WSW of Adak, Alaska on Wed, Dec 17, 2025, 4:18 PM HAST (02:18 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M4.5 142 km WSW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.5 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Dec 17, 2025, 4:18 PM HAST
UTC: 2025-12-18 02:18:46 UTC
Depth: 23.9 km (14.8 mi), shallow
Epicenter: 51.105° N, 179.447° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 stations
2.9	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.3 · 19 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.5 km horizontally, 9.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 220°, poorly surrounded by stations
Stations used: 20

Nearby

Within 100 km, magnitude 1.5 and up: 50 in the 60 days after this one and 33 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000s8t5 (also filed as ak2025yummjz). Read Fri, Oct 2, 2026, 10:10 AM UTC.