Alaska earthquakes

M4.9 earthquake 63 km SSW of Adak, Alaska

A magnitude 4.9 earthquake struck 63 km SSW of Adak, Alaska on Sun, Sep 27, 1987, 6:04 PM HADT (03:04 UTC), 33 km (21 mi) below the surface.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1987-09-28 03:04:36 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.336° N, 176.926° 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: 4 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 3.773 km ESE of Adak, Alaska · 14233 days ago · 33 km deep · 87 km away
  2. 3.333 km N of Adak, Alaska · 14216 days ago · 33 km deep · 96 km away
  3. 4.664 km SSE of Adak, Alaska · 14210 days ago · 33 km deep · 52 km away
  4. 4.1104 km S of Adak, Alaska · 14188 days ago · 33 km deep · 44 km away

Before

  1. 4.950 km ESE of Adak, Alaska · 14239 days ago · 67 km deep · 86 km away
  2. 5.065 km SE of Adak, Alaska · 14242 days ago · 33 km deep · 62 km away
  3. 5.143 km E of Adak, Alaska · 14257 days ago · 49 km deep · 92 km away
  4. 4.569 km SE of Adak, Alaska · 14267 days ago · 33 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00038sy. Read Tue, Sep 22, 2026, 10:26 AM UTC.