Alaska earthquakes

M4.0 earthquake 103 km SSE of Sand Point, Alaska

A magnitude 4.0 earthquake struck 103 km SSE of Sand Point, Alaska on Tue, Jul 6, 2021, 1:34 PM AKDT (21:34 UTC), 29 km (18 mi) below the surface.

A larger quake followed: M4.6 106 km SSE of Sand Point, Alaska. This one was a foreshock.

Sand Point 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: 4.0 (mb), light
Local time: Tue, Jul 6, 2021, 1:34 PM AKDT
UTC: 2021-07-06 21:34:52 UTC
Depth: 28.7 km (17.8 mi), shallow
Epicenter: 54.524° N, 159.720° 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: 0.1% of gravity
Peak ground velocity: -4.0 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 3.8 km horizontally, 7.0 km in depth
Magnitude uncertainty: ±0.26
Depth from: From location
Station coverage gap: 201°, poorly surrounded by stations
Stations used: 36

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast103 kmSSE

Nearby

Within 100 km, magnitude 1.5 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 us7000ej7l (also filed as ak0218lm7e8d). Read Thu, Sep 24, 2026, 4:00 AM UTC.