Alaska earthquakes

M2.8 earthquake 253 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 253 km W of Adak, Alaska on Thu, Jun 21, 2018, 3:06 AM GMT+12 (15:06 UTC), 100 km (62 mi) below the surface.

A larger quake followed: M4.5 Rat Islands, Aleutian Islands, 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: Thu, Jun 21, 2018, 3:06 AM GMT+12
UTC: 2018-06-20 15:06:41 UTC
Depth: 99.6 km (61.9 mi), intermediate-depth
Epicenter: 51.741° N, 179.697° E
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 5.7 km horizontally, 7.7 km in depth
Depth from: From location
Station coverage gap: 126°
Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: 144 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 144.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000f0rb (also filed as ak19787187, ak0187v1v81h). Read Fri, Oct 2, 2026, 6:46 AM UTC.