M2.9 earthquake 284 km SW of Adak, Alaska
A magnitude 2.9 earthquake struck 284 km SW of Adak, Alaska on Tue, Dec 4, 2018, 9:43 AM GMT-12 (21:43 UTC), 22 km (14 mi) below the surface.
A larger quake followed: M3.8 219 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
- 2.9 (ML, local (Richter)), micro
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-12-04 21:43:16 UTC
- Depth
- 22.1 km (13.7 mi), shallow
- Epicenter
- 50.174° N, 179.667° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 2.9 | ML, local (Richter) | USGS National Earthquake Information Center | Preferred · Reviewed |
| 2.9 | ML, local (Richter) | Alaska Earthquake Center | Preliminary |
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 11.8 km horizontally, 13.7 km in depth
- Depth from
- From location
- Station coverage gap
- 334°, poorly surrounded by stations
- Stations used
- 11
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 3.8219 km WSW of Adak, Alaska · 2845 days ago · 10 km deep · 94 km away
- 2.9Rat Islands, Aleutian Islands, Alaska · 2830 days ago · 29 km deep · 72 km away
- 2.6244 km SW of Adak, Alaska · 2828 days ago · 10 km deep · 64 km away
- 3.0Andreanof Islands, Aleutian Islands, Alaska · 2808 days ago · 10 km deep · 18 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000iwdc (also filed as ak20529638, ak018fjcenlb). Read Fri, Oct 2, 2026, 7:44 AM UTC.