Alaska earthquakes

M4.8 earthquake 236 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 236 km WSW of Adak, Alaska on Tue, May 5, 1987, 11:04 PM HADT (08:04 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 226 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.8 (mb), light
Local time
UTC
1987-05-06 08:04:44 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.354° N, 179.947° 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 1.8 and up: 4 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 5.0226 km WSW of Adak, Alaska · 14381 days ago · 33 km deep · 10 km away
  2. 4.8289 km WSW of Adak, Alaska · 14355 days ago · 33 km deep · 54 km away
  3. 4.8248 km WSW of Adak, Alaska · 14353 days ago · 33 km deep · 60 km away
  4. 4.7192 km WSW of Adak, Alaska · 14353 days ago · 33 km deep · 55 km away

Before

  1. 4.9243 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 42 km away
  2. 4.8246 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 33 km away
  3. 4.8246 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 54 km away
  4. 4.4244 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 23 km away
  5. 5.1249 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 42 km away
  6. 4.9245 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 18 km away
  7. 4.5298 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 83 km away
  8. 5.2239 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 32 km away
  9. 5.3262 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 58 km away
  10. 6.8235 km WSW of Adak, Alaska · 14385 days ago · 20 km deep · 10 km away
  11. 4.3190 km WSW of Adak, Alaska · 14406 days ago · 33 km deep · 76 km away
  12. 4.7242 km WSW of Adak, Alaska · 14413 days ago · 33 km deep · 7 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00034s9. Read Tue, Sep 22, 2026, 10:25 PM UTC.