Alaska earthquakes

M4.6 earthquake 44 km SW of Atka, Alaska

A magnitude 4.6 earthquake struck 44 km SW of Atka, Alaska on Mon, Jul 6, 1987, 9:55 AM HADT (18:55 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.1 83 km SSW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.6 (mb), light
Local time
UTC
1987-07-06 18:55:46 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.913° N, 174.663° 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 1.6 and up: 5 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 5.183 km SSW of Atka, Alaska · 14331 days ago · 33 km deep · 44 km away
  2. 4.377 km WNW of Atka, Alaska · 14295 days ago · 33 km deep · 70 km away
  3. 4.786 km SSW of Atka, Alaska · 14282 days ago · 33 km deep · 51 km away
  4. 4.660 km SSW of Atka, Alaska · 14279 days ago · 33 km deep · 26 km away
  5. 4.8110 km ESE of Adak, Alaska · 14275 days ago · 33 km deep · 76 km away

Before

  1. 5.083 km SSW of Atka, Alaska · 14331 days ago · 33 km deep · 51 km away
  2. 5.291 km SSW of Atka, Alaska · 14331 days ago · 33 km deep · 57 km away
  3. 4.265 km SSW of Atka, Alaska · 14332 days ago · 33 km deep · 28 km away
  4. 5.154 km SSW of Atka, Alaska · 14332 days ago · 33 km deep · 17 km away
  5. 5.984 km SSW of Atka, Alaska · 14332 days ago · 33 km deep · 45 km away
  6. 5.685 km SSW of Atka, Alaska · 14332 days ago · 33 km deep · 47 km away
  7. 5.388 km SSW of Atka, Alaska · 14333 days ago · 33 km deep · 50 km away
  8. 4.689 km SSE of Atka, Alaska · 14347 days ago · 33 km deep · 82 km away
  9. 4.975 km SW of Atka, Alaska · 14359 days ago · 33 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00036dr. Read Wed, Sep 30, 2026, 5:00 PM UTC.