Alaska earthquakes

M4.7 earthquake 41 km SSE of Sand Point, Alaska

A magnitude 4.7 earthquake struck 41 km SSE of Sand Point, Alaska on Sat, Dec 23, 2017, 10:11 AM AKST (19:11 UTC), 44 km (27 mi) below the surface.

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: 4.7 (Mwr, regional moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Dec 23, 2017, 10:11 AM AKST
UTC: 2017-12-23 19:11:00 UTC
Depth: 44.0 km (27.4 mi), shallow
Epicenter: 54.969° N, 160.361° W
Region: Alaska
Felt reports: 1
Strongest shaking: IV, light shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.7	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.05 · 38 stations
4.7	Mw, moment	Alaska Earthquake Center	Preliminary

Shaking

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

Strongest estimated: IV, light shaking
Map: Automatic

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

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was V, moderate shaking.

Fault motion and ground failure

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

Faulting: Reverse (thrust)
Moment magnitude: 4.7 Mwr
Nodal plane 1: Strike 48°, dip 70°, rake 107°
Nodal plane 2: Strike 187°, dip 26°, rake 52°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.6 km horizontally, 5.3 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 122°
Stations used: 279

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast42 kmSSE

Nearby

Within 100 km, magnitude 1.7 and up: 41 in the 60 days after this one and 21 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000bvf4 (also filed as ak17649369, ak017geq8huk). Read Thu, Oct 1, 2026, 3:34 AM UTC.