Alaska earthquakes

M3.6 earthquake 168 km WSW of Adak, Alaska

A magnitude 3.6 earthquake struck 168 km WSW of Adak, Alaska on Thu, Nov 30, 2023, 1:36 AM HAST (11:36 UTC), 28 km (18 mi) below the surface.

A larger quake followed: M4.7 134 km SW 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: 3.6 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Thu, Nov 30, 2023, 1:36 AM HAST
UTC: 2023-11-30 11:36:25 UTC
Depth: 28.3 km (17.6 mi), shallow
Epicenter: 51.445° N, 178.965° W
Region: Alaska
Felt reports: 1
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
3.6	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.091 · 16 stations
3.1	ML, local (Richter)	Alaska Earthquake Center	Preliminary
3.22	ML, local (Richter)	AV	Final · ±0.267233357147972 · 14 stations

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 11.9 km horizontally, 15.0 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 297°, poorly surrounded by stations
Stations used: 13

Nearby

Within 100 km, magnitude 1.5 and up: 103 in the 60 days after this one and 77 in the 30 days before it.

After

The first 60 of 103.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000leyg (also filed as av92139011, ak023fck9gc8). Read Sun, Oct 4, 2026, 8:04 PM UTC.