M3.9 earthquake 47 km SW of Adak, Alaska
A magnitude 3.9 earthquake struck 47 km SW of Adak, Alaska on Mon, Jan 9, 1978, 11:18 AM GMT-11 (22:18 UTC), 121 km (75 mi) below the surface.
A larger quake followed: M4.7 58 km ESE 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
- 3.9 (mb), minor
- Local time
- UTC
- 1978-01-09 22:18:14 UTC
- Depth
- 121.0 km (75.2 mi), intermediate-depth
- Epicenter
- 51.608° N, 177.172° 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.
- Stations used
- 14
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 8 in the 30 days before it.
After
- 4.156 km SE of Adak, Alaska · 17752 days ago · 56 km deep · 71 km away
- 4.758 km ESE of Adak, Alaska · 17740 days ago · 65 km deep · 96 km away
Before
- 5.344 km ESE of Adak, Alaska · 17799 days ago · 63 km deep · 82 km away
- 5.1135 km SW of Adak, Alaska · 17803 days ago · 33 km deep · 88 km away
- 4.166 km SSE of Adak, Alaska · 17816 days ago · 53 km deep · 69 km away
- 4.065 km S of Adak, Alaska · 17817 days ago · 56 km deep · 57 km away
- 4.661 km SSE of Adak, Alaska · 17817 days ago · 54 km deep · 63 km away
- 5.176 km S of Adak, Alaska · 17817 days ago · 53 km deep · 69 km away
- 4.281 km SSE of Adak, Alaska · 17817 days ago · 44 km deep · 78 km away
- 4.368 km SSE of Adak, Alaska · 17819 days ago · 50 km deep · 71 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000se5. Read Wed, Sep 30, 2026, 4:08 PM UTC.