Alaska earthquakes

M3.5 earthquake 132 km WSW of Adak, Alaska

A magnitude 3.5 earthquake struck 132 km WSW of Adak, Alaska on Wed, Apr 1, 2020, 3:45 PM HADT (00:45 UTC), 32 km (20 mi) below the surface.

A larger quake followed: M3.8 97 km SW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
3.5 (mb), minor
Local time
UTC
2020-04-02 00:45:47 UTC
Depth
32.4 km (20.1 mi), shallow
Epicenter
51.227° N, 178.242° 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 3.2 km horizontally, 11.5 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
210°, poorly surrounded by stations
Stations used
46

Nearby

Within 100 km, magnitude 1.5 and up: 156 in the 60 days after this one and 110 in the 30 days before it.

After

The first 60 of 156.

Before

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us700091i5 (also filed as ak02049t90pm). Read Wed, Sep 30, 2026, 6:28 PM UTC.