Alaska earthquakes

M2.5 earthquake 136 km W of Adak, Alaska

A magnitude 2.5 earthquake struck 136 km W of Adak, Alaska on Mon, Mar 23, 2020, 2:13 PM HADT (23:13 UTC), 138 km (86 mi) below the surface.

A larger quake followed: M4.8 138 km WSW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.5 (ml), micro
Local time: Mon, Mar 23, 2020, 2:13 PM HADT
UTC: 2020-03-23 23:13:02 UTC
Depth: 137.7 km (85.6 mi), intermediate-depth
Epicenter: 51.833° N, 178.608° 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 11.5 km horizontally, 4.6 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 157°
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 153 in the 60 days after this one and 87 in the 30 days before it.

After

The first 60 of 153.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008kr4 (also filed as ak0203tndkgm). Read Wed, Sep 30, 2026, 9:11 AM UTC.