Alaska earthquakes

M2.5 earthquake 220 km W of Adak, Alaska

A magnitude 2.5 earthquake struck 220 km W of Adak, Alaska on Fri, Oct 19, 2018, 2:39 PM HADT (23:39 UTC), 80 km (50 mi) below the surface.

A larger quake followed: M4.8 206 km WNW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.5 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Oct 19, 2018, 2:39 PM HADT
UTC: 2018-10-19 23:39:26 UTC
Depth: 79.9 km (49.7 mi), intermediate-depth
Epicenter: 51.610° N, 179.803° 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 5.2 km horizontally, 6.9 km in depth
Depth from: From location
Station coverage gap: 164°
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 100 in the 60 days after this one and 119 in the 30 days before it.

After

The first 60 of 100.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000hh8f (also filed as ak20287656, ak018dfauq3g). Read Thu, Oct 1, 2026, 9:46 PM UTC.