Alaska earthquakes

M4.5 earthquake 84 km S of False Pass, Alaska

A magnitude 4.5 earthquake struck 84 km S of False Pass, Alaska on Sun, Oct 28, 2018, 5:33 AM AKDT (13:33 UTC), 39 km (24 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
4.5 (mwr), light
Local time
UTC
2018-10-28 13:33:21 UTC
Depth
38.6 km (24.0 mi), shallow
Epicenter
54.094° N, 163.530° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

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
Oblique normal
Moment magnitude
4.5 Mwr
Nodal plane 1
Strike 82°, dip 25°, rake -56°
Nodal plane 2
Strike 225°, dip 70°, rake -105°

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 2.8 km horizontally, 5.8 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
92°
Stations used
99

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 59 in the 60 days after this one and 25 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000hi81 (also filed as ak20295501, ak018du0p7n6). Read Wed, Sep 30, 2026, 7:52 AM UTC.