Alaska earthquakes

M4.6 earthquake 48 km SW of Atka, Alaska

A magnitude 4.6 earthquake struck 48 km SW of Atka, Alaska on Wed, Mar 14, 2018, 1:42 AM HADT (10:42 UTC), 68 km (42 mi) below the surface.

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The earthquake

Magnitude: 4.6 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Mar 14, 2018, 1:42 AM HADT
UTC: 2018-03-14 10:42:27 UTC
Depth: 68.2 km (42.3 mi), shallow
Epicenter: 51.907° N, 174.732° 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
4.6	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.032 · 290 stations
4.6	mb, body-wave	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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.0 km horizontally, 6.3 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 179°
Stations used: 149

Nearby

Within 100 km, magnitude 1.6 and up: 53 in the 60 days after this one and 48 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000d484 (also filed as ak18695426, ak0183cwfq77). Read Thu, Oct 1, 2026, 10:03 PM UTC.