Alaska earthquakes

M3.7 earthquake 42 km ESE of Cantwell, Alaska

A magnitude 3.7 earthquake struck 42 km ESE of Cantwell, Alaska on Wed, Jun 20, 2018, 1:34 AM AKDT (09:34 UTC), 72 km (45 mi) below the surface.

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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: 3.7 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Wed, Jun 20, 2018, 1:34 AM AKDT
UTC: 2018-06-20 09:34:07 UTC
Depth: 71.9 km (44.7 mi), intermediate-depth
Epicenter: 63.305° N, 148.123° 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
3.7	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.9	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · ±0.061 · 26 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: 3.9 Mwr
Nodal plane 1: Strike 148°, dip 85°, rake 27°
Nodal plane 2: Strike 55°, dip 63°, rake 174°

How well it is located

Reviewed by a seismologist.

Stations used: 272

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 66 in the 60 days after this one and 39 in the 30 days before it.

After

The first 60 of 66.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0187uygjsf (also filed as ak19786492, us1000ewc3). Read Sun, Oct 4, 2026, 7:56 AM UTC.