Alaska earthquakes

M7.1 earthquake 75 km S of Adak, Alaska

A magnitude 7.1 earthquake struck 75 km S of Adak, Alaska on Thu, Mar 14, 1957, 3:47 AM GMT-11 (14:47 UTC), 25 km (16 mi) below the surface.

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The earthquake

Magnitude
7.1 (mw), major
Local time
UTC
1957-03-14 14:47:50 UTC
Depth
25.0 km (15.5 mi), shallow
Epicenter
51.196° N, 176.733° 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.

Magnitude uncertainty
±0.20
Depth from
From location

Nearby

Within 100 km, magnitude 2.5 and up: 1 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 6.061 km SSW of Adak, Alaska · 25389 days ago · 35 km deep · 18 km away

Before

  1. 7.160 km SW of Adak, Alaska · 25396 days ago · 20 km deep · 48 km away
  2. 6.0136 km S of Adak, Alaska · 25397 days ago · 33 km deep · 62 km away
  3. 6.890 km SSW of Adak, Alaska · 25397 days ago · 15 km deep · 21 km away
  4. 6.4146 km S of Adak, Alaska · 25398 days ago · 33 km deep · 70 km away
  5. 8.61957 Atka, Alaska Earthquake · 25399 days ago · 25 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem886155 (also filed as ushis2173). Read Tue, Sep 22, 2026, 8:44 AM UTC.