M4.0 earthquake 250 km SSW of Adak, Alaska
A magnitude 4.0 earthquake struck 250 km SSW of Adak, Alaska on Mon, Nov 13, 2017, 10:34 AM HAST (20:34 UTC), 10 km (6 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-11-13 20:34:46 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 49.858° N, 178.230° 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 |
|---|---|---|---|
| 4.0 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.183 · 8 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 3.6 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.18
- Depth from
- Operator assigned
- Station coverage gap
- 256°, poorly surrounded by stations
- Stations used
- 33
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 2.5177 km SSW of Adak, Alaska · 3221 days ago · 10 km deep · 76 km away
- 2.6187 km SSW of Adak, Alaska · 3186 days ago · 27 km deep · 64 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000bmuz (also filed as ak17200800, ak017eklh2y2). Read Fri, Oct 2, 2026, 9:14 AM UTC.