Alaska earthquakes

M3.4 earthquake 118 km S of Unalaska, Alaska

A magnitude 3.4 earthquake struck 118 km S of Unalaska, Alaska on Mon, Aug 7, 2023, 5:21 PM AKDT (01:21 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.3 96 km S of Unalaska, Alaska. This one was a foreshock.

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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
UTC
2023-08-08 01:21:12 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
52.821° N, 166.806° 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 4.8 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
215°, poorly surrounded by stations
Stations used
25

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 123 in the 60 days after this one and 88 in the 30 days before it.

After

The first 60 of 123.

Before

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000kq8d (also filed as ak023a3uybce). Read Tue, Sep 29, 2026, 4:23 PM UTC.