Alaska earthquakes

M4.7 earthquake 186 km WSW of Adak, Alaska

A magnitude 4.7 earthquake struck 186 km WSW of Adak, Alaska on Tue, Apr 19, 1977, 1:19 PM GMT-11 (00:19 UTC), 33 km (21 mi) below the surface.

More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude
4.7 (mb), light
Local time
UTC
1977-04-20 00:19:13 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.118° N, 179.034° 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
OPERATOR_ASSIGNED
Stations used
34

Nearby

Within 100 km, magnitude 1.7 and up: 1 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.5173 km W of Adak, Alaska · 18005 days ago · 56 km deep · 60 km away

Before

  1. 4.4232 km WSW of Adak, Alaska · 18059 days ago · 64 km deep · 54 km away
  2. 5.1206 km W of Adak, Alaska · 18059 days ago · 46 km deep · 76 km away
  3. 4.6243 km WSW of Adak, Alaska · 18061 days ago · 59 km deep · 62 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000nfu. Read Tue, Sep 22, 2026, 9:43 PM UTC.