M2.9 earthquake 191 km S of Adak, Alaska
A magnitude 2.9 earthquake struck 191 km S of Adak, Alaska on Tue, Apr 21, 2026, 10:37 AM HADT (19:37 UTC), 20 km (12 mi) below the surface.
A larger quake followed: M3.2 101 km S 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
- 2026-04-21 19:37:08 UTC
- Depth
- 19.9 km (12.3 mi), shallow
- Epicenter
- 50.155° N, 176.828° 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 · ±0.128 · 8 stations |
| 3.1 | ML, local (Richter) | Alaska Earthquake Center | Reviewed · ±0.1 · 10 stations |
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 10.2 km horizontally, 9.9 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- From location
- Station coverage gap
- 307°, poorly surrounded by stations
- Stations used
- 14
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
- 2.7143 km S of Adak, Alaska · 147 days ago · 13 km deep · 49 km away
- 2.9169 km S of Adak, Alaska · 128 days ago · 10 km deep · 53 km away
- 3.2101 km S of Adak, Alaska · 121 days ago · 20 km deep · 95 km away
- 2.8136 km SSE of Adak, Alaska · 106 days ago · 9 km deep · 72 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000ss4d (also filed as aka2026hvkxra). Read Fri, Oct 2, 2026, 2:56 PM UTC.