Alaska earthquakes

M4.3 earthquake 86 km SW of Adak, Alaska

A magnitude 4.3 earthquake struck 86 km SW of Adak, Alaska on Tue, Oct 11, 2016, 11:24 PM HADT (08:24 UTC), 55 km (34 mi) below the surface.

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The earthquake

Magnitude: 4.3 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Oct 11, 2016, 11:24 PM HADT
UTC: 2016-10-12 08:24:46 UTC
Depth: 55.1 km (34.3 mi), shallow
Epicenter: 51.270° N, 177.418° 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
4.3	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.066 · 66 stations
4.3	mb, body-wave	Alaska Earthquake Center	Preliminary

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 10.1 km horizontally, 3.7 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 190°, poorly surrounded by stations
Stations used: 80

Nearby

Within 100 km, magnitude 1.5 and up: 114 in the 60 days after this one and 74 in the 30 days before it.

After

The first 60 of 114.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20007dd0 (also filed as ak016d54lykx, ak14198891). Read Sun, Oct 4, 2026, 3:14 AM UTC.