Alaska earthquakes

M4.8 earthquake 35 km SE of Unalaska, Alaska

A magnitude 4.8 earthquake struck 35 km SE of Unalaska, Alaska on Mon, Mar 30, 2020, 12:21 AM AKDT (08:21 UTC), 87 km (54 mi) below the surface.

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: 4.8 (mww), light
Local time: Mon, Mar 30, 2020, 12:21 AM AKDT
UTC: 2020-03-30 08:21:15 UTC
Depth: 86.9 km (54.0 mi), intermediate-depth
Epicenter: 53.625° N, 166.206° W
Region: Alaska
Felt reports: 6
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

6 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Oblique reverse
Moment magnitude: 4.8 Mww
Nodal plane 1: Strike 141°, dip 46°, rake 36°
Nodal plane 2: Strike 24°, dip 65°, rake 130°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.6 km horizontally, 3.9 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 81°
Stations used: 200

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast35 kmSE

Nearby

Within 100 km, magnitude 1.8 and up: 41 in the 60 days after this one and 19 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008ik0 (also filed as ak02044z98gt). Read Wed, Sep 30, 2026, 9:11 AM UTC.