Alaska earthquakes

M3.4 earthquake 16 km WSW of Unalaska, Alaska

A magnitude 3.4 earthquake struck 16 km WSW of Unalaska, Alaska on Sat, Jul 18, 2020, 7:21 PM AKDT (03:21 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.6 68 km SE of Unalaska, Alaska. This one was a foreshock.

Unalaska forecast More in Alaska

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: Sat, Jul 18, 2020, 7:21 PM AKDT
UTC: 2020-07-19 03:21:09 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 53.805° N, 166.752° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.2 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 165°
Stations used: 53

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast16 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 76 in the 60 days after this one and 67 in the 30 days before it.

After

The first 60 of 76.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000ark6 (also filed as av62200201, ak02098gxkv4). Read Mon, Sep 28, 2026, 8:20 PM UTC.