Alaska earthquakes

M3.0 earthquake 210 km SW of Nikolski, Alaska

A magnitude 3.0 earthquake struck 210 km SW of Nikolski, Alaska on Fri, Mar 16, 2018, 3:49 PM HADT (00:49 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.4 172 km ESE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.0 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Mar 16, 2018, 3:49 PM HADT
UTC: 2018-03-17 00:49:03 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.620° N, 171.072° 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
3.0	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.148 · 6 stations
2.8	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 7.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 231°, poorly surrounded by stations
Stations used: 17

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 24 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 us1000d8fj (also filed as ak0183hp4w03, ak18744670). Read Sat, Oct 3, 2026, 3:36 PM UTC.