Alaska earthquakes

M3.7 earthquake 270 km W of Adak, Alaska

A magnitude 3.7 earthquake struck 270 km W of Adak, Alaska on Mon, Mar 16, 2020, 11:49 PM GMT+12 (11:49 UTC), 70 km (44 mi) below the surface.

A larger quake followed: M4.7 251 km W of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.7 (mb), minor
Local time: Mon, Mar 16, 2020, 11:49 PM GMT+12
UTC: 2020-03-16 11:49:17 UTC
Depth: 70.5 km (43.8 mi), intermediate-depth
Epicenter: 51.554° N, 179.486° E
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 7.2 km horizontally, 7.0 km in depth
Magnitude uncertainty: ±0.18
Depth from: From location
Station coverage gap: 124°
Stations used: 46

Nearby

Within 100 km, magnitude 1.5 and up: 109 in the 60 days after this one and 56 in the 30 days before it.

After

The first 60 of 109.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008th9 (also filed as ak0203hvoonc). Read Wed, Sep 30, 2026, 10:10 AM UTC.