M5.5 earthquake 209 km WSW of Adak, Alaska
A magnitude 5.5 earthquake struck 209 km WSW of Adak, Alaska on Thu, Sep 11, 1969, 10:00 PM GMT-10 (08:00 UTC), 35 km (22 mi) below the surface.
A larger quake followed: M6.7 194 km WSW 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
- 5.5 (mw), moderate
- Local time
- UTC
- 1969-09-12 08:00:17 UTC
- Depth
- 35.0 km (21.7 mi), shallow
- Epicenter
- 51.048° N, 179.345° 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: 5 in the 60 days after this one and 0 in the 30 days before it.
After
- 6.7194 km WSW of Adak, Alaska · 20829 days ago · 35 km deep · 26 km away
- 5.5194 km WSW of Adak, Alaska · 20829 days ago · 35 km deep · 15 km away
- 5.8189 km WSW of Adak, Alaska · 20789 days ago · 40 km deep · 28 km away
- 6.5175 km WSW of Adak, Alaska · 20780 days ago · 38 km deep · 38 km away
- 6.0169 km WSW of Adak, Alaska · 20773 days ago · 10 km deep · 40 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem804397. Read Tue, Sep 22, 2026, 5:06 AM UTC.