Alaska earthquakes

M4.8 earthquake 126 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 126 km WSW of Adak, Alaska on Wed, Sep 26, 2018, 8:55 PM HADT (05:55 UTC), 10 km (6 mi) below the surface.

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The earthquake

Magnitude: 4.8 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Sep 26, 2018, 8:55 PM HADT
UTC: 2018-09-27 05:55:10 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.602° N, 178.411° 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
4.8	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.033 · 279 stations
4.9	Mw, moment	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 5.2 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.03
Depth from: Operator assigned
Station coverage gap: 125°
Stations used: 296

Nearby

Within 100 km, magnitude 1.8 and up: 159 in the 60 days after this one and 84 in the 30 days before it.

After

The first 60 of 159.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000h34x (also filed as ak20265006, ak018cemeof0). Read Fri, Oct 2, 2026, 4:37 AM UTC.