Alaska earthquakes

M4.0 earthquake 27 km ESE of Ugashik, Alaska

A magnitude 4.0 earthquake struck 27 km ESE of Ugashik, Alaska on Wed, Feb 15, 2017, 10:30 PM AKST (07:30 UTC), 123 km (76 mi) below the surface.

A larger quake followed: M4.8 34 km S of Ugashik, Alaska. This one was a foreshock.

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Map

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

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The earthquake

Magnitude: 4.0 (ML, local (Richter)), light
Magnitude from: Alaska Earthquake Center
Local time: Wed, Feb 15, 2017, 10:30 PM AKST
UTC: 2017-02-16 07:30:20 UTC
Depth: 122.5 km (76.1 mi), intermediate-depth
Epicenter: 57.434° N, 156.957° 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
4.0	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
4.3	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.238 · 5 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 171

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 128 in the 60 days after this one and 47 in the 30 days before it.

After

The first 60 of 128.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak01725ulthb (also filed as ak15277651, us20008k5c). Read Sun, Oct 4, 2026, 9:42 AM UTC.