Alaska earthquakes

M1.9 earthquake 88 km W of Adak, Alaska

A magnitude 1.9 earthquake struck 88 km W of Adak, Alaska on Sat, Feb 22, 2020, 5:27 AM HAST (15:27 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M5.0 71 km WNW of Adak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 1.9 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Sat, Feb 22, 2020, 5:27 AM HAST
UTC: 2020-02-22 15:27:52 UTC
Depth: 5.0 km (3.1 mi), shallow
Epicenter: 51.837° N, 177.924° 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
1.9	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
1.8	ML, local (Richter)	AV	Final · ±0.239 · 12 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 35

Nearby

Within 100 km, magnitude 1.5 and up: 197 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of 197.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0202fwkso3 (also filed as av62137966). Read Thu, Oct 1, 2026, 11:26 PM UTC.