Alaska earthquakes

M2.5 earthquake 66 km SE of Adak, Alaska

A magnitude 2.5 earthquake struck 66 km SE of Adak, Alaska on Thu, Oct 19, 2017, 5:09 PM HADT (02:09 UTC), 27 km (17 mi) below the surface.

A larger quake followed: M4.9 82 km SW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.5 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Thu, Oct 19, 2017, 5:09 PM HADT
UTC: 2017-10-20 02:09:47 UTC
Depth: 27.1 km (16.8 mi), shallow
Epicenter: 51.422° N, 176.008° 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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed
2.5	ML, local (Richter)	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 2.9 km horizontally, 11.4 km in depth
Depth from: From location
Station coverage gap: 230°, poorly surrounded by stations
Stations used: 19

Nearby

Within 100 km, magnitude 1.5 and up: 140 in the 60 days after this one and 48 in the 30 days before it.

After

The first 60 of 140.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000aw5i (also filed as ak17090401, ak017dglpkwg). Read Fri, Oct 2, 2026, 1:04 AM UTC.