Alaska earthquakes

M2.5 earthquake 143 km ENE of Atka, Alaska

A magnitude 2.5 earthquake struck 143 km ENE of Atka, Alaska on Thu, Oct 20, 2016, 12:46 AM HADT (09:46 UTC), 81 km (51 mi) below the surface.

A larger quake followed: M4.9 112 km ENE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
2.5 (ML, local (Richter)), micro
Magnitude from
Alaska Earthquake Center
Local time
UTC
2016-10-20 09:46:24 UTC
Depth
81.3 km (50.5 mi), intermediate-depth
Epicenter
52.836° N, 172.370° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used
12

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 4.9112 km ENE of Atka, Alaska · 3635 days ago · 131 km deep · 34 km away
  2. 3.0151 km ENE of Atka, Alaska · 3632 days ago · 114 km deep · 44 km away
  3. 2.653 km E of Atka, Alaska · 3626 days ago · 85 km deep · 99 km away
  4. 2.684 km E of Atka, Alaska · 3621 days ago · 71 km deep · 85 km away
  5. 2.260 km ENE of Atka, Alaska · 3592 days ago · 40 km deep · 83 km away
  6. 3.1157 km NE of Atka, Alaska · 3589 days ago · 259 km deep · 42 km away
  7. 3.2185 km E of Atka, Alaska · 3587 days ago · 41 km deep · 99 km away
  8. 3.286 km NE of Atka, Alaska · 3582 days ago · 131 km deep · 57 km away
  9. 3.6174 km ENE of Atka, Alaska · 3582 days ago · 104 km deep · 44 km away

Before

  1. 3.5135 km ENE of Atka, Alaska · 3651 days ago · 12 km deep · 10 km away
  2. 3.8109 km ENE of Atka, Alaska · 3653 days ago · 179 km deep · 35 km away
  3. 3.070 km ENE of Atka, Alaska · 3656 days ago · 124 km deep · 73 km away
  4. 1.850 km ENE of Atka, Alaska · 3658 days ago · 21 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak016didmufh (also filed as ak14267125). Read Sat, Oct 3, 2026, 12:43 PM UTC.