Alaska earthquakes

M2.9 earthquake 171 km S of Adak, Alaska

A magnitude 2.9 earthquake struck 171 km S of Adak, Alaska on Mon, Oct 2, 2017, 10:48 AM HADT (19:48 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.0 86 km SSE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.9 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Oct 2, 2017, 10:48 AM HADT
UTC: 2017-10-02 19:48:23 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.346° N, 176.291° 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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed
2.9	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 5.6 km horizontally, 2.0 km in depth
Depth from: Operator assigned
Station coverage gap: 234°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 1 in the 30 days before it.

After

Before

2.3161 km S of Adak, AlaskaSun, Sep 10, 12:41 AM HADT · 3309 days ago · 38 km deep · 42 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000b396 (also filed as ak17000756, ak017cn4e0nv). Read Fri, Oct 2, 2026, 7:43 AM UTC.