M4.7 earthquake 248 km W of Adak, Alaska
A magnitude 4.7 earthquake struck 248 km W of Adak, Alaska on Wed, Jan 20, 1999, 7:38 PM GMT+12 (07:38 UTC), 170 km (106 mi) below the surface.
A larger quake followed: M5.3 266 km W 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
- 4.7 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1999-01-20 07:38:35 UTC
- Depth
- 169.9 km (105.6 mi), intermediate-depth
- Epicenter
- 52.291° N, 179.801° E
- 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
- CONSTRAINED_BY_DEPTH_PHASES
Nearby
Within 100 km, magnitude 1.7 and up: 5 in the 60 days after this one and 3 in the 30 days before it.
After
- 3.8215 km W of Adak, Alaska · 10086 days ago · 70 km deep · 68 km away
- 3.5173 km WNW of Adak, Alaska · 10084 days ago · 33 km deep · 79 km away
- 5.3266 km W of Adak, Alaska · 10076 days ago · 72 km deep · 80 km away
- 3.7Rat Islands, Aleutian Islands, Alaska · 10075 days ago · 33 km deep · 94 km away
- 4.5Rat Islands, Aleutian Islands, Alaska · 10060 days ago · 33 km deep · 100 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00091cx. Read Sat, Oct 3, 2026, 1:16 AM UTC.