M4.8 earthquake 203 km WSW of Adak, Alaska
A magnitude 4.8 earthquake struck 203 km WSW of Adak, Alaska on Wed, Oct 10, 1984, 12:38 PM HADT (21:38 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.4 282 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
- 4.8 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1984-10-10 21:38:09 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.086° N, 179.275° 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.
- Depth from
- OPERATOR_ASSIGNED
Nearby
Within 100 km, magnitude 1.8 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.7178 km W of Adak, Alaska · 15326 days ago · 33 km deep · 63 km away
- 5.4282 km WSW of Adak, Alaska · 15314 days ago · 39 km deep · 87 km away
- 5.3275 km WSW of Adak, Alaska · 15312 days ago · 57 km deep · 82 km away
- 4.8286 km WSW of Adak, Alaska · 15290 days ago · 33 km deep · 92 km away
- 4.5281 km WSW of Adak, Alaska · 15290 days ago · 33 km deep · 80 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002824. Read Sat, Oct 3, 2026, 10:42 AM UTC.