Alaska earthquakes

M5.0 earthquake 46 km SSW of Adak, Alaska

A magnitude 5.0 earthquake struck 46 km SSW of Adak, Alaska on Thu, Nov 30, 2023, 6:33 AM HAST (16:33 UTC), 48 km (30 mi) below the surface.

Map

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

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The earthquake

Magnitude: 5.0 (Mwr, regional moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Thu, Nov 30, 2023, 6:33 AM HAST
UTC: 2023-11-30 16:33:06 UTC
Depth: 48.4 km (30.1 mi), shallow
Epicenter: 51.477° N, 176.827° W
Region: Alaska
Felt reports: 1
Strongest shaking: III, weak 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	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.078 · 16 stations
5.0	Mwr, regional moment	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: III, weak shaking
Peak ground acceleration: 1.6% of gravity
Peak ground velocity: -0.3 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: 5.0 Mwr
Nodal plane 1: Strike 64°, dip 67°, rake 80°
Nodal plane 2: Strike 268°, dip 25°, rake 112°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.0 km horizontally, 4.1 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 56°
Stations used: 226

Nearby

Within 100 km, magnitude 2.0 and up: 91 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 91.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000leuk (also filed as ak023fcn7xtk). Read Thu, Oct 1, 2026, 10:44 AM UTC.