Alaska earthquakes

M5.1 earthquake 132 km SW of Nikolski, Alaska

A magnitude 5.1 earthquake struck 132 km SW of Nikolski, Alaska on Tue, Mar 14, 2017, 12:01 PM HADT (21:01 UTC), 54 km (34 mi) below the surface.

A larger quake followed: M5.2 146 km SW of Nikolski, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.1 (mb, body-wave), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Mar 14, 2017, 12:01 PM HADT
UTC: 2017-03-14 21:01:12 UTC
Depth: 54.1 km (33.6 mi), shallow
Epicenter: 52.284° N, 170.500° W
Region: Alaska
Strongest shaking: III, weak 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
5.1	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.036 · 246 stations
5.05	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.1	mb, body-wave	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: III, weak shaking
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 6.4 km horizontally, 5.7 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 130°
Stations used: 302

Nearby

Within 100 km, magnitude 2.1 and up: 35 in the 60 days after this one and 30 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 us20008s6s (also filed as ak15493287, ak0173d2qo6x, iscgem610329073). Read Sun, Oct 4, 2026, 1:55 AM UTC.