Alaska earthquakes

M5.2 earthquake 189 km SSE of Unalaska, Alaska

A magnitude 5.2 earthquake struck 189 km SSE of Unalaska, Alaska on Sat, Aug 3, 2019, 10:11 AM AKDT (18:11 UTC), 23 km (15 mi) below the surface.

A larger quake followed: M5.3 139 km ESE of Nikolski, 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: 5.2 (mww), moderate
Local time: Sat, Aug 3, 2019, 10:11 AM AKDT
UTC: 2019-08-03 18:11:27 UTC
Depth: 23.5 km (14.6 mi), shallow
Epicenter: 52.248° N, 165.689° 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 II, weak shaking.

Fault motion and ground failure

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

Faulting: Normal
Moment magnitude: 5.2 Mww
Nodal plane 1: Strike 261°, dip 33°, rake -71°
Nodal plane 2: Strike 58°, dip 59°, rake -102°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.7 km horizontally, 3.1 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 32°
Stations used: 247

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast189 kmSSE

Nearby

Within 100 km, magnitude 2.2 and up: 30 in the 60 days after this one and 1 in the 30 days before it.

After

Before

2.2288 km SSE of Unalaska, AlaskaSat, Aug 3, 10:11 AM AKDT · 2615 days ago · 1 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60005083 (also filed as ak0199vvbu1o, iscgem616200625). Read Wed, Sep 30, 2026, 9:37 AM UTC.