Alaska earthquakes

M5.0 earthquake 68 km SSW of Adak, Alaska

A magnitude 5.0 earthquake struck 68 km SSW of Adak, Alaska on Thu, Oct 3, 2024, 4:08 AM HADT (13:08 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.8 82 km ESE of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.0 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Thu, Oct 3, 2024, 4:08 AM HADT
UTC: 2024-10-03 13:08:40 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.290° N, 176.938° 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
5.0	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.071 · 19 stations
5.0	Mww, W-phase moment	Alaska Earthquake Center	Preliminary
5.0	Mwr, regional moment	USGS National Earthquake Information Center	Moment tensor · Reviewed

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: 1.7% of gravity
Peak ground velocity: 1.1 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 I, not felt 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: 5.0 Mww
Nodal plane 1: Strike 63°, dip 57°, rake 80°
Nodal plane 2: Strike 261°, dip 34°, rake 105°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.4 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 78°
Stations used: 113

Nearby

Within 100 km, magnitude 2.0 and up: at least 199 in the 60 days after this one and 100 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000nw9t (also filed as ak024cqbnkiv). Read Sat, Oct 3, 2026, 10:08 AM UTC.