M4.8 earthquake 57 km SE of Unalaska, Alaska
A magnitude 4.8 earthquake struck 57 km SE of Unalaska, Alaska on Sat, Aug 23, 1986, 3:55 AM AKDT (11:55 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 38 km ESE of Akutan, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.8 (mb), light
- Local time
- UTC
- 1986-08-23 11:55:12 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 53.547° N, 165.855° 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 1.8 and up: 4 in the 60 days after this one and 7 in the 30 days before it.
After
- 4.560 km SW of Unalaska, Alaska · 14637 days ago · 33 km deep · 85 km away
- 4.657 km SW of Unalaska, Alaska · 14621 days ago · 33 km deep · 92 km away
- 5.038 km ESE of Akutan, Alaska · 14615 days ago · 33 km deep · 72 km away
- 4.894 km S of Unalaska, Alaska · 14590 days ago · 33 km deep · 84 km away
Before
- 4.688 km ESE of Akutan, Alaska · 14658 days ago · 33 km deep · 99 km away
- 4.560 km WSW of Unalaska, Alaska · 14664 days ago · 33 km deep · 97 km away
- 4.6105 km S of Unalaska, Alaska · 14666 days ago · 33 km deep · 89 km away
- 4.662 km SW of Unalaska, Alaska · 14670 days ago · 33 km deep · 91 km away
- 4.763 km SW of Unalaska, Alaska · 14671 days ago · 33 km deep · 88 km away
- 5.0112 km S of Unalaska, Alaska · 14675 days ago · 33 km deep · 91 km away
- 4.779 km SSW of Unalaska, Alaska · 14676 days ago · 33 km deep · 93 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002xf1. Read Wed, Sep 30, 2026, 6:39 PM UTC.