M4.6 earthquake 114 km S of Unalaska, Alaska
A magnitude 4.6 earthquake struck 114 km S of Unalaska, Alaska on Thu, Jul 25, 1985, 8:46 AM AKDT (16:46 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.1 122 km S of Unalaska, 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
- 1985-07-25 16:46:38 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 52.848° N, 166.721° 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
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 4 in the 60 days after this one and 0 in the 30 days before it.
After
- 5.1122 km S of Unalaska, Alaska · 15034 days ago · 33 km deep · 10 km away
- 4.695 km S of Unalaska, Alaska · 15032 days ago · 33 km deep · 20 km away
- 4.3172 km SSE of Unalaska, Alaska · 15012 days ago · 33 km deep · 97 km away
- 4.4Fox Islands, Aleutian Islands, Alaska · 15006 days ago · 52 km deep · 84 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002h2z. Read Tue, Sep 22, 2026, 9:25 PM UTC.