Alaska earthquakes

M2.8 earthquake 152 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 152 km W of Adak, Alaska on Tue, Sep 19, 2017, 9:42 AM HADT (18:42 UTC), 206 km (128 mi) below the surface.

A larger quake followed: M4.8 131 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.8 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Sep 19, 2017, 9:42 AM HADT
UTC: 2017-09-19 18:42:37 UTC
Depth: 206.1 km (128.1 mi), intermediate-depth
Epicenter: 52.063° N, 178.831° 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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed
2.8	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 14.0 km horizontally, 4.5 km in depth
Depth from: From location
Station coverage gap: 178°
Stations used: 24

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 133 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000asyb (also filed as ak16875918, ak017c1lrt76). Read Fri, Oct 2, 2026, 7:07 AM UTC.