M6.4 earthquake 92 km WSW of Adak, Alaska
A magnitude 6.4 earthquake struck 92 km WSW of Adak, Alaska on Mon, Jan 25, 1971, 5:08 AM GMT-11 (16:08 UTC), 40 km (25 mi) below the surface.
A larger quake followed: M6.9 61 km SSW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.4 (mw), strong
- Local time
- UTC
- 1971-01-25 16:08:17 UTC
- Depth
- 40.0 km (24.9 mi), shallow
- Epicenter
- 51.449° N, 177.778° 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
- ±0.23
- Depth from
- From location
Nearby
Within 100 km, magnitude 3.4 and up: 5 in the 60 days after this one and 0 in the 30 days before it.
After
- 6.961 km SSW of Adak, Alaska · 20325 days ago · 30 km deep · 65 km away
- 5.986 km SSW of Adak, Alaska · 20325 days ago · 25 km deep · 59 km away
- 5.682 km SSW of Adak, Alaska · 20325 days ago · 25 km deep · 64 km away
- 5.5103 km SSW of Adak, Alaska · 20325 days ago · 35 km deep · 69 km away
- 5.590 km SSW of Adak, Alaska · 20320 days ago · 35 km deep · 59 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem788547 (also filed as ushis3128). Read Wed, Sep 30, 2026, 11:50 PM UTC.