Alaska earthquakes

M3.9 earthquake 23 km NE of Susitna North, Alaska

A magnitude 3.9 earthquake struck 23 km NE of Susitna North, Alaska on Fri, Sep 14, 2018, 1:25 AM AKDT (09:25 UTC), 55 km (34 mi) below the surface.

Susitna North forecast More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 3.9 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Fri, Sep 14, 2018, 1:25 AM AKDT
UTC: 2018-09-14 09:25:32 UTC
Depth: 54.5 km (33.9 mi), shallow
Epicenter: 62.331° N, 149.598° W
Region: Alaska
Felt reports: 7
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
3.9	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
4.1	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · ±0.036 · 74 stations

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
Peak ground acceleration: 193.0% of gravity
Peak ground velocity: 0.2 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

7 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Fault motion and ground failure

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

Faulting: Normal
Moment magnitude: 4.1 Mwr
Nodal plane 1: Strike 6°, dip 59°, rake -105°
Nodal plane 2: Strike 213°, dip 34°, rake -67°

How well it is located

Reviewed by a seismologist.

Stations used: 279

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 91 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak018bt6misc (also filed as ak20254005, us2000heju). Read Fri, Oct 2, 2026, 10:21 AM UTC.