Alaska earthquakes

M4.5 earthquake 221 km SE of Chiniak, Alaska

A magnitude 4.5 earthquake struck 221 km SE of Chiniak, Alaska on Fri, Mar 30, 2018, 5:07 PM AKDT (01:07 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M5.5 276 km ESE of Chiniak, Alaska. This one was a foreshock.

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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 (mb), light
Local time: Fri, Mar 30, 2018, 5:07 PM AKDT
UTC: 2018-03-31 01:07:48 UTC
Depth: 14.1 km (8.7 mi), shallow
Epicenter: 56.093° N, 149.946° 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.3 km horizontally, 5.2 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 141°
Stations used: 289

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 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000dbrr (also filed as ak18855911, ak01844v0a1q, iscgem611850082). Read Sat, Sep 26, 2026, 10:48 PM UTC.