Alaska earthquakes

M4.9 earthquake 62 km SSE of Atka, Alaska

A magnitude 4.9 earthquake struck 62 km SSE of Atka, Alaska on Tue, Apr 17, 1979, 6:20 PM GMT-11 (05:20 UTC), 49 km (30 mi) below the surface.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1979-04-18 05:20:04 UTC
Depth
49.0 km (30.4 mi), shallow
Epicenter
51.666° N, 173.904° 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.

How well it is located

Reviewed by a seismologist.

Depth from
CONSTRAINED_BY_DEPTH_PHASES
Stations used
121

Nearby

Within 100 km, magnitude 1.9 and up: 1 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.464 km ESE of Atka, Alaska · 17307 days ago · 33 km deep · 46 km away

Before

  1. 5.087 km WSW of Atka, Alaska · 17346 days ago · 43 km deep · 99 km away
  2. 4.645 km ESE of Atka, Alaska · 17353 days ago · 33 km deep · 48 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000103x. Read Tue, Sep 22, 2026, 4:04 PM UTC.