Alaska earthquakes

M2.5 earthquake 196 km S of Unalaska, Alaska

A magnitude 2.5 earthquake struck 196 km S of Unalaska, Alaska on Tue, Apr 5, 2016, 6:51 PM AKDT (02:51 UTC), 74 km (46 mi) below the surface.

A larger quake followed: M4.1 104 km ESE of Nikolski, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.5 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2016-04-06 02:51:24 UTC
Depth
73.9 km (45.9 mi), intermediate-depth
Epicenter
52.123° N, 166.174° 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.ScaleComputed byNotes
2.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed
2.9ML, local (Richter)Alaska Earthquake CenterPreliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 6.6 km horizontally, 10.1 km in depth
Stations used
8

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 16 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 2.6190 km SSE of Unalaska, Alaska · 3828 days ago · 28 km deep · 47 km away
  2. 1.9137 km ESE of Nikolski, Alaska · 3828 days ago · 13 km deep · 70 km away
  3. 3.8182 km SSE of Unalaska, Alaska · 3814 days ago · 13 km deep · 72 km away
  4. 2.6226 km SSE of Unalaska, Alaska · 3813 days ago · 28 km deep · 94 km away
  5. 3.6126 km SSE of Unalaska, Alaska · 3800 days ago · 13 km deep · 91 km away
  6. 4.1104 km ESE of Nikolski, Alaska · 3800 days ago · 33 km deep · 99 km away
  7. 2.8199 km ESE of Nikolski, Alaska · 3796 days ago · 30 km deep · 15 km away
  8. 2.0122 km SSE of Unalaska, Alaska · 3795 days ago · 21 km deep · 91 km away
  9. 1.9117 km SSE of Unalaska, Alaska · 3795 days ago · 10 km deep · 96 km away
  10. 2.7143 km ESE of Nikolski, Alaska · 3794 days ago · 26 km deep · 65 km away
  11. 1.9136 km ESE of Nikolski, Alaska · 3792 days ago · 9 km deep · 74 km away
  12. 1.7142 km S of Unalaska, Alaska · 3785 days ago · 25 km deep · 57 km away
  13. 2.4139 km ESE of Nikolski, Alaska · 3783 days ago · 15 km deep · 70 km away
  14. 3.1138 km S of Unalaska, Alaska · 3779 days ago · 11 km deep · 66 km away
  15. 3.6133 km S of Unalaska, Alaska · 3778 days ago · 27 km deep · 78 km away
  16. 2.3119 km ESE of Nikolski, Alaska · 3774 days ago · 7 km deep · 86 km away

Before

  1. 3.9215 km SSE of Unalaska, Alaska · 3834 days ago · 22 km deep · 85 km away
  2. 2.2124 km S of Unalaska, Alaska · 3835 days ago · 20 km deep · 79 km away
  3. 2.1102 km SSE of Unalaska, Alaska · 3860 days ago · 22 km deep · 100 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20005iva (also filed as ak13451212, ak0164ggmiir). Read Sun, Oct 4, 2026, 10:47 PM UTC.