M6.9 earthquake 61 km SSW of Adak, Alaska
A magnitude 6.9 earthquake struck 61 km SSW of Adak, Alaska on Sat, Feb 6, 1971, 3:29 PM GMT-11 (02:29 UTC), 30 km (19 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.9 (mw), strong
- Local time
- UTC
- 1971-02-07 02:29:29 UTC
- Depth
- 30.0 km (18.6 mi), shallow
- Epicenter
- 51.341° N, 176.850° W
- Region
- Alaska
- Strongest shaking
- VI, strong shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- VI, strong shaking
- Peak ground acceleration
- 23.1% of gravity
- Peak ground velocity
- 2.9 cm/s
- Map
- Automatic
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
- ±0.28
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.986 km SSW of Adak, Alaska · 20316 days ago · 25 km deep · 27 km away
- 5.682 km SSW of Adak, Alaska · 20316 days ago · 25 km deep · 22 km away
- 5.5103 km SSW of Adak, Alaska · 20316 days ago · 35 km deep · 43 km away
- 5.590 km SSW of Adak, Alaska · 20312 days ago · 35 km deep · 31 km away
- 5.895 km SSW of Adak, Alaska · 20265 days ago · 25 km deep · 43 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem786954 (also filed as ushis3131, atlas19710207022927). Read Tue, Sep 22, 2026, 5:17 AM UTC.