Alaska earthquakes

M3.7 earthquake 32 km S of Adak, Alaska

A magnitude 3.7 earthquake struck 32 km S of Adak, Alaska on Thu, Jul 16, 2020, 7:07 AM HADT (16:07 UTC), 54 km (34 mi) below the surface.

A larger quake followed: M4.0 72 km NE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.7 (mb), minor
Local time: Thu, Jul 16, 2020, 7:07 AM HADT
UTC: 2020-07-16 16:07:39 UTC
Depth: 54.0 km (33.5 mi), shallow
Epicenter: 51.580° N, 176.674° 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 6.4 km horizontally, 5.9 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 135°
Stations used: 125

Nearby

Within 100 km, magnitude 1.5 and up: 178 in the 60 days after this one and 117 in the 30 days before it.

After

The first 60 of 178.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000asf4 (also filed as ak02093pz8fi). Read Tue, Sep 29, 2026, 8:59 AM UTC.