Alaska earthquakes

M5.7 earthquake 99 km ESE of Chignik, Alaska

A magnitude 5.7 earthquake struck 99 km ESE of Chignik, Alaska on Wed, Jul 28, 2021, 10:23 PM AKDT (06:23 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M6.9 125 km SE of Perryville, 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: 5.7 (mb), moderate
Local time: Wed, Jul 28, 2021, 10:23 PM AKDT
UTC: 2021-07-29 06:23:02 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 55.876° N, 156.992° 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 7.0 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.17
Depth from: Operator assigned
Station coverage gap: 122°
Stations used: 54

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast228 kmENE

Nearby

Within 100 km, magnitude 2.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f2gj (also filed as iscgem626337071). Read Thu, Sep 24, 2026, 8:00 AM UTC.