Alaska earthquakes

M4.3 earthquake 159 km SSW of Atka, Alaska

A magnitude 4.3 earthquake struck 159 km SSW of Atka, Alaska on Sun, Jul 5, 1987, 4:07 PM HADT (01:07 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
4.3 (mb), light
Local time
UTC
1987-07-06 01:07:22 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
50.821° N, 174.850° 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 1.5 and up: 8 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 4.265 km SSW of Atka, Alaska · 14323 days ago · 33 km deep · 96 km away
  2. 5.291 km SSW of Atka, Alaska · 14323 days ago · 33 km deep · 68 km away
  3. 5.083 km SSW of Atka, Alaska · 14323 days ago · 33 km deep · 76 km away
  4. 5.183 km SSW of Atka, Alaska · 14323 days ago · 33 km deep · 78 km away
  5. 4.1110 km SSE of Adak, Alaska · 14307 days ago · 33 km deep · 80 km away
  6. 4.786 km SSW of Atka, Alaska · 14273 days ago · 33 km deep · 73 km away
  7. 4.660 km SSW of Atka, Alaska · 14271 days ago · 33 km deep · 99 km away
  8. 4.8110 km ESE of Adak, Alaska · 14266 days ago · 33 km deep · 66 km away

Before

  1. 5.984 km SSW of Atka, Alaska · 14323 days ago · 33 km deep · 77 km away
  2. 5.685 km SSW of Atka, Alaska · 14324 days ago · 33 km deep · 75 km away
  3. 5.388 km SSW of Atka, Alaska · 14324 days ago · 33 km deep · 72 km away
  4. 4.386 km SSE of Adak, Alaska · 14344 days ago · 33 km deep · 95 km away
  5. 4.975 km SW of Atka, Alaska · 14351 days ago · 33 km deep · 93 km away
  6. 5.095 km SSW of Atka, Alaska · 14353 days ago · 33 km deep · 65 km away
  7. 4.879 km S of Atka, Alaska · 14353 days ago · 33 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00036cq. Read Tue, Sep 22, 2026, 8:59 AM UTC.