Alaska earthquakes

M4.9 earthquake 47 km SE of Adak, Alaska

A magnitude 4.9 earthquake struck 47 km SE of Adak, Alaska on Sat, Oct 25, 2025, 1:13 AM HADT (10:13 UTC), 57 km (35 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.

Open the live map with earthquakes

The earthquake

Magnitude: 4.9 (Mww, W-phase moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Oct 25, 2025, 1:13 AM HADT
UTC: 2025-10-25 10:13:06 UTC
Depth: 56.5 km (35.1 mi), shallow
Epicenter: 51.580° N, 176.133° W
Region: Alaska
Felt reports: 1
Strongest shaking: IV, light shaking
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
4.9	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.103 · 9 stations
5.1	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: IV, light shaking
Peak ground acceleration: 1.6% of gravity
Peak ground velocity: 1.0 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Reverse (thrust)
Moment magnitude: 4.9 Mww
Nodal plane 1: Strike 222°, dip 26°, rake 86°
Nodal plane 2: Strike 46°, dip 64°, rake 92°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.8 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 89°
Stations used: 92

Nearby

Within 100 km, magnitude 1.9 and up: 89 in the 60 days after this one and 11 in the 30 days before it.

After

The first 60 of 89.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rjeu (also filed as ak025dp06jw4). Read Fri, Oct 2, 2026, 12:01 PM UTC.