Alaska earthquakes

M4.1 earthquake 259 km SE of Perryville, Alaska

A magnitude 4.1 earthquake struck 259 km SE of Perryville, Alaska on Tue, Jun 29, 2021, 6:36 AM AKDT (14:36 UTC), 10 km (6 mi) below the surface.

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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: 4.1 (mb), light
Local time: Tue, Jun 29, 2021, 6:36 AM AKDT
UTC: 2021-06-29 14:36:06 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 54.288° N, 156.231° W
Region: Alaska
Strongest shaking: I, not felt shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: I, not felt shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: -6.5 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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 4.4 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.21
Depth from: Operator assigned
Station coverage gap: 168°
Stations used: 50

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast297 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 94 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 94.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000equ9 (also filed as ak02189xa954). Read Mon, Sep 28, 2026, 2:07 PM UTC.