Alaska earthquakes

M3.4 earthquake 252 km WSW of Adak, Alaska

A magnitude 3.4 earthquake struck 252 km WSW of Adak, Alaska on Fri, Apr 17, 2020, 2:47 PM GMT+12 (02:47 UTC), 57 km (35 mi) below the surface.

A larger quake followed: M4.7 251 km W 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: 3.4 (ml), minor
Local time: Fri, Apr 17, 2020, 2:47 PM GMT+12
UTC: 2020-04-17 02:47:06 UTC
Depth: 56.8 km (35.3 mi), shallow
Epicenter: 51.393° N, 179.802° 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 4.2 km horizontally, 6.2 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 188°, poorly surrounded by stations
Stations used: 21

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 48 in the 30 days before it.

After

The first 60 of 113.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60009bg4 (also filed as ak0204ynifsc). Read Wed, Sep 30, 2026, 9:12 AM UTC.