Alaska earthquakes

M2.5 earthquake 43 km ENE of Adak, Alaska

A magnitude 2.5 earthquake struck 43 km ENE of Adak, Alaska on Wed, Aug 30, 2017, 9:48 PM HADT (06:48 UTC), 165 km (102 mi) below the surface.

A larger quake followed: M4.4 77 km ESE 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: 2.5 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Aug 30, 2017, 9:48 PM HADT
UTC: 2017-08-31 06:48:29 UTC
Depth: 164.5 km (102.2 mi), intermediate-depth
Epicenter: 52.003° N, 176.044° 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 10.6 km horizontally, 4.7 km in depth
Stations used: 19

Nearby

Within 100 km, magnitude 1.5 and up: 76 in the 60 days after this one and 61 in the 30 days before it.

After

The first 60 of 76.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000ahtg (also filed as ak16777358, ak017b5zgaal). Read Fri, Oct 2, 2026, 1:50 AM UTC.