Alaska earthquakes

M2.8 earthquake 200 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 200 km W of Adak, Alaska on Tue, Feb 27, 2018, 12:30 AM HAST (10:30 UTC), 123 km (76 mi) below the surface.

A larger quake followed: M3.9 251 km WSW of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude: 2.8 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Feb 27, 2018, 12:30 AM HAST
UTC: 2018-02-27 10:30:01 UTC
Depth: 122.8 km (76.3 mi), intermediate-depth
Epicenter: 51.816° N, 179.541° 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 5.0 km horizontally, 6.6 km in depth
Depth from: From location
Station coverage gap: 158°
Stations used: 17

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 49 in the 30 days before it.

After

The first 60 of 113.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000dcnx (also filed as ak18560471, ak0182o3awab). Read Fri, Oct 2, 2026, 2:21 AM UTC.