Alaska earthquakes

M3.4 earthquake 46 km NNE of Adak, Alaska

A magnitude 3.4 earthquake struck 46 km NNE of Adak, Alaska on Sat, Jul 3, 2021, 9:01 AM HADT (18:01 UTC), 198 km (123 mi) below the surface.

A larger quake followed: M5.0 49 km ESE of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.4 (ml), minor
Local time: Sat, Jul 3, 2021, 9:01 AM HADT
UTC: 2021-07-03 18:01:39 UTC
Depth: 197.6 km (122.8 mi), intermediate-depth
Epicenter: 52.275° N, 176.459° 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 16.1 km horizontally, 5.4 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 172°
Stations used: 34

Nearby

Within 100 km, magnitude 1.5 and up: 148 in the 60 days after this one and 16 in the 30 days before it.

After

The first 60 of 148.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f76e (also filed as ak0218gllyla). Read Thu, Sep 24, 2026, 11:10 AM UTC.