Alaska earthquakes

M4.6 earthquake 155 km S of False Pass, Alaska

A magnitude 4.6 earthquake struck 155 km S of False Pass, Alaska on Mon, Apr 16, 2018, 6:51 AM AKDT (14:51 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 160 km ESE of Akutan, Alaska. This one was a foreshock.

Akutan forecastMore in Alaska

Map

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

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The earthquake

Magnitude
4.6 (mb), light
Local time
UTC
2018-04-16 14:51:28 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
53.454° N, 163.468° W
Region
Alaska
Felt reports
1
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

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

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 2.7 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.05
Depth from
Operator assigned
Station coverage gap
164°
Stations used
153

Nearest places

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

Nearby

Within 100 km, magnitude 1.6 and up: 165 in the 60 days after this one and 46 in the 30 days before it.

After

The first 60 of 165.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000e0z5 (also filed as ak19240269, ak0184vjlujo). Read Wed, Sep 30, 2026, 10:18 PM UTC.