Alaska earthquakes

M2.8 earthquake 34 km WNW of Nelson Lagoon, Alaska

A magnitude 2.8 earthquake struck 34 km WNW of Nelson Lagoon, Alaska on Mon, Apr 16, 2018, 8:51 AM AKDT (16:51 UTC), 220 km (137 mi) below the surface.

A larger quake followed: M4.1 44 km NW of Nelson Lagoon, 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: 2.8 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Apr 16, 2018, 8:51 AM AKDT
UTC: 2018-04-16 16:51:50 UTC
Depth: 220.1 km (136.8 mi), intermediate-depth
Epicenter: 56.132° N, 161.715° W
Region: Alaska
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
2.8	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.148 · 6 stations
3.0	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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 7.7 km horizontally, 7.2 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 114°
Stations used: 65

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast117 kmNW

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 9 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 us1000dnvn (also filed as ak19240731, ak0184vksrk2). Read Thu, Oct 1, 2026, 1:04 PM UTC.