M3.6 earthquake 266 km SE of Atka, Alaska
A magnitude 3.6 earthquake struck 266 km SE of Atka, Alaska on Sun, Apr 15, 2018, 10:24 PM HADT (07:24 UTC), 16 km (10 mi) below the surface.
A larger quake followed: M3.7 268 km SE 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
- 3.6 (mb, body-wave), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-04-16 07:24:11 UTC
- Depth
- 15.7 km (9.8 mi), shallow
- Epicenter
- 50.833° N, 171.036° 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 |
|---|---|---|---|
| 3.6 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.072 · 49 stations |
| 3.2 | 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 7.5 km horizontally, 8.5 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- From location
- Station coverage gap
- 237°, poorly surrounded by stations
- Stations used
- 74
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 2 in the 30 days before it.
After
- 3.7268 km SE of Atka, Alaska · 3087 days ago · 15 km deep · 5 km away
- 2.8223 km ESE of Atka, Alaska · 3066 days ago · 10 km deep · 46 km away
- 2.9244 km SSW of Nikolski, Alaska · 3047 days ago · 37 km deep · 36 km away
- 2.6188 km SE of Atka, Alaska · 3039 days ago · 10 km deep · 81 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000dnv2 (also filed as ak19244713, ak0184vf9zx7). Read Fri, Oct 2, 2026, 3:18 AM UTC.