M6.3 earthquake 200 km SW of Adak, Alaska
A magnitude 6.3 earthquake struck 200 km SW of Adak, Alaska on Wed, Oct 27, 1920, 8:23 PM GMT-11 (07:23 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
- 6.3 (mw), strong
- Local time
- UTC
- 1920-10-28 07:23:43 UTC
- Depth
- 15.0 km (9.3 mi), shallow
- Epicenter
- 50.710° N, 178.821° 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 iscgem912652 (also filed as ushis665). Read Mon, Sep 21, 2026, 9:14 PM UTC.