Alaska earthquakes

M3.6 earthquake 134 km W of Adak, Alaska

A magnitude 3.6 earthquake struck 134 km W of Adak, Alaska on Wed, May 20, 2020, 4:31 AM HADT (13:31 UTC), 134 km (84 mi) below the surface.

A larger quake followed: M5.2 186 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: 3.6 (mb), minor
Local time: Wed, May 20, 2020, 4:31 AM HADT
UTC: 2020-05-20 13:31:31 UTC
Depth: 134.4 km (83.5 mi), intermediate-depth
Epicenter: 51.943° N, 178.589° 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 10.8 km horizontally, 6.7 km in depth
Magnitude uncertainty: ±0.11
Depth from: From location
Station coverage gap: 111°
Stations used: 62

Nearby

Within 100 km, magnitude 1.5 and up: 181 in the 60 days after this one and 60 in the 30 days before it.

After

The first 60 of 181.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000a446 (also filed as ak0206hepa5j). Read Wed, Sep 30, 2026, 3:05 AM UTC.