Alaska earthquakes

M4.7 earthquake 74 km SSE of Adak, Alaska

A magnitude 4.7 earthquake struck 74 km SSE of Adak, Alaska on Fri, May 22, 1987, 10:01 PM HADT (07:01 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.9 84 km SSW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.7 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1987-05-23 07:01:04 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.307° N, 176.074° 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 1.7 and up: 18 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.581 km SSE of Adak, Alaska · 14377 days ago · 33 km deep · 9 km away
  2. 4.397 km ESE of Adak, Alaska · 14375 days ago · 33 km deep · 59 km away
  3. 3.697 km SSE of Adak, Alaska · 14374 days ago · 33 km deep · 26 km away
  4. 4.982 km SW of Adak, Alaska · 14369 days ago · 33 km deep · 96 km away
  5. 5.036 km SE of Adak, Alaska · 14369 days ago · 58 km deep · 40 km away
  6. 4.975 km SW of Atka, Alaska · 14361 days ago · 33 km deep · 92 km away
  7. 4.386 km SSE of Adak, Alaska · 14354 days ago · 33 km deep · 15 km away
  8. 4.986 km S of Adak, Alaska · 14346 days ago · 33 km deep · 41 km away
  9. 4.588 km S of Adak, Alaska · 14346 days ago · 33 km deep · 42 km away
  10. 4.0100 km S of Adak, Alaska · 14339 days ago · 33 km deep · 46 km away
  11. 4.588 km S of Adak, Alaska · 14339 days ago · 33 km deep · 35 km away
  12. 4.784 km S of Adak, Alaska · 14339 days ago · 33 km deep · 34 km away
  13. 5.097 km S of Adak, Alaska · 14339 days ago · 33 km deep · 42 km away
  14. 4.583 km S of Adak, Alaska · 14339 days ago · 33 km deep · 37 km away
  15. 5.388 km SSW of Atka, Alaska · 14335 days ago · 33 km deep · 98 km away
  16. 5.984 km SSW of Atka, Alaska · 14334 days ago · 33 km deep · 96 km away
  17. 5.183 km SSW of Atka, Alaska · 14333 days ago · 33 km deep · 96 km away
  18. 4.1110 km SSE of Adak, Alaska · 14318 days ago · 33 km deep · 38 km away

Before

  1. 5.061 km SE of Adak, Alaska · 14385 days ago · 33 km deep · 27 km away
  2. 4.760 km SE of Adak, Alaska · 14387 days ago · 33 km deep · 14 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000356z. Read Sat, Oct 3, 2026, 4:18 AM UTC.