Alaska earthquakes

M3.8 earthquake 59 km SSE of Sand Point, Alaska

A magnitude 3.8 earthquake struck 59 km SSE of Sand Point, Alaska on Wed, Oct 27, 2021, 5:56 AM AKDT (13:56 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.1 95 km SSE of Perryville, 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: 3.8 (mb), minor
Local time: Wed, Oct 27, 2021, 5:56 AM AKDT
UTC: 2021-10-27 13:56:13 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 54.824° N, 160.234° W
Region: Alaska
Strongest shaking: II, weak 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: II, weak shaking
Peak ground acceleration: 0.1% of gravity
Peak ground velocity: -3.3 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 4.7 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 91°
Stations used: 98

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast59 kmSSE

Nearby

Within 100 km, magnitude 1.5 and up: 198 in the 60 days after this one and 1 in the 30 days before it.

After

The first 60 of 198.

Before

2.787 km SSE of King Cove, AlaskaWed, Oct 27, 12:30 AM AKDT · 1792 days ago · 35 km deep · 97 km away

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fp6h (also filed as ak021dsdas4m). Read Wed, Sep 23, 2026, 12:03 AM UTC.