M3.7 earthquake 268 km SE of Atka, Alaska
A magnitude 3.7 earthquake struck 268 km SE of Atka, Alaska on Thu, Apr 19, 2018, 8:42 PM HADT (05:42 UTC), 15 km (9 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.7 (mb, body-wave), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-04-20 05:42:54 UTC
- Depth
- 15.1 km (9.4 mi), shallow
- Epicenter
- 50.859° N, 170.978° 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 |
|---|---|---|---|
| 3.7 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.096 · 28 stations |
| 3.5 | 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 8.6 km horizontally, 8.6 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 227°, poorly surrounded by stations
- Stations used
- 61
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 2.8223 km ESE of Atka, Alaska · 3065 days ago · 10 km deep · 47 km away
- 2.9244 km SSW of Nikolski, Alaska · 3047 days ago · 37 km deep · 31 km away
- 2.6188 km SE of Atka, Alaska · 3039 days ago · 10 km deep · 83 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000dr9y (also filed as ak018520cgqe, ak19263801). Read Thu, Oct 1, 2026, 6:19 PM UTC.