M4.6 earthquake 121 km SE of Adak, Alaska
A magnitude 4.6 earthquake struck 121 km SE of Adak, Alaska on Thu, Oct 24, 1985, 2:29 PM HADT (23:29 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.1 88 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
- 1985-10-24 23:29:41 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.215° N, 175.234° 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: 5 in the 60 days after this one and 0 in the 30 days before it.
After
- 5.188 km SSW of Atka, Alaska · 14916 days ago · 53 km deep · 53 km away
- 4.869 km SSW of Atka, Alaska · 14905 days ago · 33 km deep · 65 km away
- 4.767 km S of Adak, Alaska · 14899 days ago · 33 km deep · 99 km away
- 4.4118 km SE of Adak, Alaska · 14895 days ago · 33 km deep · 7 km away
- 4.5114 km SSW of Atka, Alaska · 14895 days ago · 33 km deep · 16 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002m3n. Read Tue, Sep 22, 2026, 11:34 AM UTC.