Alaska earthquakes

M5.0 earthquake 71 km WNW of Adak, Alaska

A magnitude 5.0 earthquake struck 71 km WNW of Adak, Alaska on Mon, Mar 23, 2020, 3:25 AM HADT (12:25 UTC), 101 km (63 mi) below the surface.

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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: 5.0 (mww), moderate
Local time: Mon, Mar 23, 2020, 3:25 AM HADT
UTC: 2020-03-23 12:25:55 UTC
Depth: 101.2 km (62.9 mi), intermediate-depth
Epicenter: 52.091° N, 177.619° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Normal
Moment magnitude: 5.0 Mww
Nodal plane 1: Strike 255°, dip 20°, rake -111°
Nodal plane 2: Strike 97°, dip 72°, rake -82°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.8 km horizontally, 3.1 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 36°
Stations used: 243

Nearby

Within 100 km, magnitude 2.0 and up: 51 in the 60 days after this one and 33 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008ei4 (also filed as ak0203tgwhcg, iscgem617812551). Read Wed, Sep 30, 2026, 9:39 AM UTC.