M4.6 earthquake 64 km SSE of Adak, Alaska
A magnitude 4.6 earthquake struck 64 km SSE of Adak, Alaska on Tue, Oct 27, 1987, 4:01 AM HAST (14:01 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 135 km SSW of Atka, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1987-10-27 14:01:37 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.364° N, 176.184° 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 1.6 and up: 6 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.1104 km S of Adak, Alaska · 14188 days ago · 33 km deep · 64 km away
- 4.6114 km SE of Adak, Alaska · 14172 days ago · 33 km deep · 59 km away
- 4.679 km E of Adak, Alaska · 14166 days ago · 33 km deep · 77 km away
- 5.0135 km SSW of Atka, Alaska · 14162 days ago · 33 km deep · 83 km away
- 4.979 km SE of Adak, Alaska · 14161 days ago · 33 km deep · 20 km away
- 4.397 km SW of Atka, Alaska · 14151 days ago · 33 km deep · 75 km away
Before
- 3.333 km N of Adak, Alaska · 14216 days ago · 33 km deep · 93 km away
- 5.388 km E of Adak, Alaska · 14222 days ago · 64 km deep · 77 km away
- 3.773 km ESE of Adak, Alaska · 14233 days ago · 33 km deep · 39 km away
- 4.963 km SSW of Adak, Alaska · 14239 days ago · 33 km deep · 52 km away
- 4.950 km ESE of Adak, Alaska · 14239 days ago · 67 km deep · 51 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00039ns. Read Tue, Sep 22, 2026, 7:51 AM UTC.