Alaska earthquakes

M4.9 earthquake 176 km WSW of Adak, Alaska

A magnitude 4.9 earthquake struck 176 km WSW of Adak, Alaska on Fri, Jul 7, 1978, 8:27 PM GMT-10 (06:27 UTC), 67 km (42 mi) below the surface.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1978-07-08 06:27:46 UTC
Depth
67.0 km (41.6 mi), shallow
Epicenter
51.261° N, 178.981° 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.

Stations used
102

Nearby

Within 100 km, magnitude 1.9 and up: 3 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.4156 km WSW of Adak, Alaska · 17604 days ago · 56 km deep · 39 km away
  2. 3.9159 km WSW of Adak, Alaska · 17595 days ago · 68 km deep · 29 km away
  3. 4.9124 km WSW of Adak, Alaska · 17594 days ago · 54 km deep · 52 km away

Before

  1. 4.6173 km WSW of Adak, Alaska · 17622 days ago · 66 km deep · 3 km away
  2. 5.9194 km W of Adak, Alaska · 17624 days ago · 33 km deep · 49 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000vfk. Read Tue, Sep 22, 2026, 4:59 AM UTC.