Alaska earthquakes

M2.9 earthquake 32 km SSW of Tonsina, Alaska

A magnitude 2.9 earthquake struck 32 km SSW of Tonsina, Alaska on Wed, Feb 28, 2018, 7:15 PM AKST (04:15 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M3.1 30 km SSE of Eureka Roadhouse, 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: 2.9 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Wed, Feb 28, 2018, 7:15 PM AKST
UTC: 2018-03-01 04:15:58 UTC
Depth: 20.0 km (12.4 mi), shallow
Epicenter: 61.385° N, 145.377° 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
2.9	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

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: 123

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 49 in the 60 days after this one and 22 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 ak0182rapwb1 (also filed as ak18572393, us2000d9iy). Read Sat, Oct 3, 2026, 1:05 AM UTC.