Alaska earthquakes

M4.2 earthquake 243 km WSW of Adak, Alaska

A magnitude 4.2 earthquake struck 243 km WSW of Adak, Alaska on Sun, Apr 5, 2020, 10:14 PM GMT-12 (10:14 UTC), 55 km (34 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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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.2 (mb), light
Local time: Sun, Apr 5, 2020, 10:14 PM GMT-12
UTC: 2020-04-06 10:14:48 UTC
Depth: 55.2 km (34.3 mi), shallow
Epicenter: 51.224° N, 179.984° 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 6.2 km horizontally, 14.6 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 216°, poorly surrounded by stations
Stations used: 48

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 54 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 us70008pu7 (also filed as ak0204gl63rp). Read Wed, Sep 30, 2026, 5:57 AM UTC.