M5.5 earthquake 254 km SSW of Nikolski, Alaska
A magnitude 5.5 earthquake struck 254 km SSW of Nikolski, Alaska on Tue, Sep 1, 1964, 6:16 AM GMT-11 (17:16 UTC), 24 km (15 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
- 1964-09-01 17:16:41 UTC
- Depth
- 23.5 km (14.6 mi), shallow
- Epicenter
- 50.949° N, 170.696° 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
- ±0.20
- 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 iscgem864053 (also filed as ushis2718). Read Tue, Sep 22, 2026, 10:02 AM UTC.