Alaska earthquakes

M3.3 earthquake 53 km NE of Adak, Alaska

A magnitude 3.3 earthquake struck 53 km NE of Adak, Alaska on Sun, Jun 28, 2020, 9:00 AM HADT (18:00 UTC), 151 km (94 mi) below the surface.

A larger quake followed: M5.2 52 km WNW 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: 3.3 (ml), minor
Local time: Sun, Jun 28, 2020, 9:00 AM HADT
UTC: 2020-06-28 18:00:55 UTC
Depth: 150.7 km (93.7 mi), intermediate-depth
Epicenter: 52.194° N, 176.049° 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 15.4 km horizontally, 7.1 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 163°
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 129 in the 60 days after this one and 61 in the 30 days before it.

After

The first 60 of 129.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000akkn (also filed as ak02089zghjs). Read Tue, Sep 29, 2026, 12:23 PM UTC.