M7.8 earthquake 234 km SSW of Nikolski, Alaska
A magnitude 7.8 earthquake struck 234 km SSW of Nikolski, Alaska on Wed, Mar 6, 1929, 2:34 PM GMT-11 (01:34 UTC), 15 km (9 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 7.8 (mw), major
- Local time
- UTC
- 1929-03-07 01:34:42 UTC
- Depth
- 15.0 km (9.3 mi), shallow
- Epicenter
- 50.906° N, 169.786° W
- Region
- Alaska
- Strongest shaking
- IV, light 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
- IV, light shaking
- Peak ground acceleration
- 2.8% of gravity
- Peak ground velocity
- 1.7 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
- ±0.40
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem907930 (also filed as ushis797). Read Tue, Sep 22, 2026, 7:31 AM UTC.