Alaska earthquakes

M4.0 earthquake 80 km ENE of Adak, Alaska

A magnitude 4.0 earthquake struck 80 km ENE of Adak, Alaska on Sun, Oct 15, 2017, 7:41 AM HADT (16:41 UTC), 188 km (117 mi) below the surface.

A larger quake followed: M4.9 82 km SW of Atka, 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: 4.0 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Oct 15, 2017, 7:41 AM HADT
UTC: 2017-10-15 16:41:45 UTC
Depth: 187.6 km (116.6 mi), intermediate-depth
Epicenter: 52.250° N, 175.630° 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
4.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.076 · 47 stations
4.0	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 10.7 km horizontally, 5.9 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 105°
Stations used: 91

Nearby

Within 100 km, magnitude 1.5 and up: 83 in the 60 days after this one and 37 in the 30 days before it.

After

The first 60 of 83.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000auuf (also filed as ak17050296, ak017d8kjrri). Read Thu, Oct 1, 2026, 10:40 PM UTC.