Alaska earthquakes

M5.2 earthquake 242 km WSW of Adak, Alaska

A magnitude 5.2 earthquake struck 242 km WSW of Adak, Alaska on Sat, Jan 25, 2020, 6:40 PM GMT-12 (06:40 UTC), 23 km (14 mi) below the surface.

A larger quake followed: M5.8 229 km WSW of Adak, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 5.2 (mww), moderate
Local time: Sat, Jan 25, 2020, 6:40 PM GMT-12
UTC: 2020-01-26 06:40:50 UTC
Depth: 23.1 km (14.4 mi), shallow
Epicenter: 51.117° N, 179.907° W
Region: Alaska
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

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: Oblique reverse
Moment magnitude: 5.2 Mww
Nodal plane 1: Strike 285°, dip 27°, rake 124°
Nodal plane 2: Strike 67°, dip 68°, rake 74°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.0 km horizontally, 4.0 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 126°
Stations used: 148

Nearby

Within 100 km, magnitude 2.2 and up: 159 in the 60 days after this one and 42 in the 30 days before it.

After

The first 60 of 159.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60007g8v (also filed as at00q4pbw3, ak020173sbc1, iscgem618124554). Read Thu, Oct 1, 2026, 1:32 AM UTC.