Alaska earthquakes

M5.0 earthquake 65 km SE of Adak, Alaska

A magnitude 5.0 earthquake struck 65 km SE of Adak, Alaska on Thu, Sep 24, 1987, 11:01 PM HADT (08:01 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.3 88 km E of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.0 (mb), moderate
Local time
UTC
1987-09-25 08:01:40 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.419° N, 176.038° 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 2.0 and up: 7 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.950 km ESE of Adak, Alaska · 14240 days ago · 67 km deep · 42 km away
  2. 4.963 km SSW of Adak, Alaska · 14240 days ago · 33 km deep · 62 km away
  3. 3.773 km ESE of Adak, Alaska · 14234 days ago · 33 km deep · 27 km away
  4. 5.388 km E of Adak, Alaska · 14223 days ago · 64 km deep · 65 km away
  5. 3.333 km N of Adak, Alaska · 14216 days ago · 33 km deep · 91 km away
  6. 4.664 km SSE of Adak, Alaska · 14210 days ago · 33 km deep · 12 km away
  7. 4.1104 km S of Adak, Alaska · 14189 days ago · 33 km deep · 75 km away

Before

  1. 5.143 km E of Adak, Alaska · 14258 days ago · 49 km deep · 57 km away
  2. 4.8110 km ESE of Adak, Alaska · 14267 days ago · 33 km deep · 54 km away
  3. 4.569 km SE of Adak, Alaska · 14268 days ago · 33 km deep · 6 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00038px. Read Tue, Sep 22, 2026, 9:30 PM UTC.