Alaska earthquakes

M3.4 earthquake 50 km S of Cantwell, Alaska

A magnitude 3.4 earthquake struck 50 km S of Cantwell, Alaska on Mon, Aug 6, 2018, 12:54 AM AKDT (08:54 UTC), 65 km (41 mi) below the surface.

A larger quake followed: M3.9 23 km NE of Susitna North, 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: 3.4 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Mon, Aug 6, 2018, 12:54 AM AKDT
UTC: 2018-08-06 08:54:45 UTC
Depth: 65.4 km (40.6 mi), shallow
Epicenter: 62.942° N, 148.785° 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
3.4	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.6	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · ±0.066 · 22 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 3.6 Mwr
Nodal plane 1: Strike 10°, dip 19°, rake 170°
Nodal plane 2: Strike 110°, dip 87°, rake 72°

How well it is located

Reviewed by a seismologist.

Stations used: 222

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 129 in the 60 days after this one and 65 in the 30 days before it.

After

The first 60 of 129.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak018a0o8sox (also filed as ak20012886, us1000g41l). Read Fri, Oct 2, 2026, 1:03 AM UTC.