M5.5 earthquake 199 km W of Adak, Alaska
A magnitude 5.5 earthquake struck 199 km W of Adak, Alaska on Wed, Oct 13, 1971, 4:01 AM GMT-10 (14:01 UTC), 96 km (60 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mw), moderate
- Local time
- UTC
- 1971-10-13 14:01:48 UTC
- Depth
- 96.0 km (59.7 mi), intermediate-depth
- Epicenter
- 51.727° N, 179.522° 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.
- Magnitude uncertainty
- ±0.40
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem779286. Read Tue, Sep 22, 2026, 9:24 PM UTC.