M5.1 earthquake 42 km E of Adak, Alaska
A magnitude 5.1 earthquake struck 42 km E of Adak, Alaska on Fri, Oct 5, 1984, 6:46 AM HADT (15:46 UTC), 68 km (42 mi) below the surface.
A larger quake followed: M5.5 90 km SW of Atka, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.1 (mw), moderate
- Local time
- UTC
- 1984-10-05 15:46:27 UTC
- Depth
- 67.5 km (41.9 mi), shallow
- Epicenter
- 51.871° N, 176.016° 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.
Nearby
Within 100 km, magnitude 2.1 and up: 4 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00027y2 (also filed as gcmtb100584c, gcmt19841005154627, iscgem540696). Read Tue, Sep 22, 2026, 8:52 PM UTC.