Alaska earthquakes

M4.5 earthquake 117 km SSW of False Pass, Alaska

A magnitude 4.5 earthquake struck 117 km SSW of False Pass, Alaska on Tue, Oct 30, 2018, 1:30 AM AKDT (09:30 UTC), 10 km (6 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, regional moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Oct 30, 2018, 1:30 AM AKDT
UTC: 2018-10-30 09:30:17 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 53.854° N, 163.983° W
Region: Alaska
Felt reports: 1
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
4.5	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.098 · 10 stations
4.5	Mw, moment	Alaska Earthquake Center	Preliminary

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Fault motion and ground failure

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

Faulting: Reverse (thrust)
Moment magnitude: 4.5 Mwr
Nodal plane 1: Strike 57°, dip 65°, rake 106°
Nodal plane 2: Strike 202°, dip 30°, rake 59°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 188°, poorly surrounded by stations
Stations used: 38

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast121 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 78 in the 60 days after this one and 40 in the 30 days before it.

After

The first 60 of 78.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000hiyh (also filed as ak20304427, ak018dx9dj5j). Read Fri, Oct 2, 2026, 12:31 AM UTC.