Alaska earthquakes

M1.9 earthquake 81 km W of Adak, Alaska

A magnitude 1.9 earthquake struck 81 km W of Adak, Alaska on Thu, Apr 23, 2020, 10:04 AM HADT (19:04 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M5.0 141 km WSW 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: Thu, Apr 23, 2020, 10:04 AM HADT
UTC: 2020-04-23 19:04:55 UTC
Depth: 5.0 km (3.1 mi), shallow
Epicenter: 51.852° N, 177.810° 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
1.91	ML, local (Richter)	AV	Final · ±0.172 · 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: 39

Nearby

Within 100 km, magnitude 1.5 and up: 183 in the 60 days after this one and 85 in the 30 days before it.

After

The first 60 of 183.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak02058uls0m (also filed as av62159551). Read Fri, Oct 2, 2026, 12:57 AM UTC.