Alaska earthquakes

M4.9 earthquake 243 km WSW of Adak, Alaska

A magnitude 4.9 earthquake struck 243 km WSW of Adak, Alaska on Tue, May 5, 1987, 7:48 PM GMT-12 (07:48 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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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1987-05-06 07:48:07 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
50.983° N, 179.825° 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 1.9 and up: 6 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 4.8236 km WSW of Adak, Alaska · 14384 days ago · 33 km deep · 42 km away
  2. 5.0226 km WSW of Adak, Alaska · 14380 days ago · 33 km deep · 46 km away
  3. 4.8289 km WSW of Adak, Alaska · 14355 days ago · 33 km deep · 61 km away
  4. 4.8248 km WSW of Adak, Alaska · 14353 days ago · 33 km deep · 18 km away
  5. 4.7192 km WSW of Adak, Alaska · 14353 days ago · 33 km deep · 50 km away
  6. 4.6145 km WSW of Adak, Alaska · 14325 days ago · 33 km deep · 98 km away

Before

  1. 4.8246 km WSW of Adak, Alaska · 14384 days ago · 33 km deep · 11 km away
  2. 4.8246 km WSW of Adak, Alaska · 14384 days ago · 33 km deep · 12 km away
  3. 4.4244 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 20 km away
  4. 5.1249 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 7 km away
  5. 4.9245 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 27 km away
  6. 4.5298 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 56 km away
  7. 5.2239 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 10 km away
  8. 5.3262 km WSW of Adak, Alaska · 14385 days ago · 33 km deep · 22 km away
  9. 6.8235 km WSW of Adak, Alaska · 14385 days ago · 20 km deep · 33 km away
  10. 4.3190 km WSW of Adak, Alaska · 14406 days ago · 33 km deep · 58 km away
  11. 4.7242 km WSW of Adak, Alaska · 14412 days ago · 33 km deep · 46 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00034s8. Read Tue, Sep 22, 2026, 5:28 PM UTC.