Alaska earthquakes

M5.1 earthquake 54 km SSW of Atka, Alaska

A magnitude 5.1 earthquake struck 54 km SSW of Atka, Alaska on Sun, Jul 5, 1987, 3:25 PM HADT (00:25 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.2 91 km SSW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.1 (mb), moderate
Local time
UTC
1987-07-06 00:25:53 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.763° N, 174.586° 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

Nearby

Within 100 km, magnitude 2.1 and up: 9 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 4.265 km SSW of Atka, Alaska · 14324 days ago · 33 km deep · 11 km away
  2. 5.291 km SSW of Atka, Alaska · 14324 days ago · 33 km deep · 40 km away
  3. 5.083 km SSW of Atka, Alaska · 14323 days ago · 33 km deep · 33 km away
  4. 4.644 km SW of Atka, Alaska · 14323 days ago · 33 km deep · 17 km away
  5. 5.183 km SSW of Atka, Alaska · 14323 days ago · 33 km deep · 29 km away
  6. 4.377 km WNW of Atka, Alaska · 14287 days ago · 33 km deep · 86 km away
  7. 4.786 km SSW of Atka, Alaska · 14274 days ago · 33 km deep · 34 km away
  8. 4.660 km SSW of Atka, Alaska · 14272 days ago · 33 km deep · 8 km away
  9. 4.8110 km ESE of Adak, Alaska · 14267 days ago · 33 km deep · 66 km away

Before

  1. 5.984 km SSW of Atka, Alaska · 14324 days ago · 33 km deep · 30 km away
  2. 5.685 km SSW of Atka, Alaska · 14325 days ago · 33 km deep · 31 km away
  3. 5.388 km SSW of Atka, Alaska · 14325 days ago · 33 km deep · 34 km away
  4. 4.689 km SSE of Atka, Alaska · 14339 days ago · 33 km deep · 69 km away
  5. 4.975 km SW of Atka, Alaska · 14351 days ago · 33 km deep · 23 km away
  6. 5.095 km SSW of Atka, Alaska · 14353 days ago · 33 km deep · 45 km away
  7. 4.879 km S of Atka, Alaska · 14354 days ago · 33 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00036cm. Read Tue, Sep 22, 2026, 10:24 PM UTC.