Alaska earthquakes

M3.5 earthquake 135 km ENE of Atka, Alaska

A magnitude 3.5 earthquake struck 135 km ENE of Atka, Alaska on Mon, Oct 3, 2016, 10:20 PM HADT (07:20 UTC), 12 km (8 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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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.5 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2016-10-04 07:20:49 UTC
Depth
12.1 km (7.5 mi), shallow
Epicenter
52.856° N, 172.523° 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.

Location uncertainty
About 6.3 km horizontally, 2.4 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
178°
Stations used
17

Nearby

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.5143 km ENE of Atka, Alaska · 3637 days ago · 81 km deep · 10 km away
  2. 4.9112 km ENE of Atka, Alaska · 3637 days ago · 131 km deep · 31 km away
  3. 3.0151 km ENE of Atka, Alaska · 3633 days ago · 114 km deep · 51 km away
  4. 2.653 km E of Atka, Alaska · 3628 days ago · 85 km deep · 93 km away
  5. 2.537 km NE of Atka, Alaska · 3627 days ago · 85 km deep · 98 km away
  6. 2.684 km E of Atka, Alaska · 3623 days ago · 71 km deep · 82 km away
  7. 2.260 km ENE of Atka, Alaska · 3593 days ago · 40 km deep · 75 km away

Before

  1. 3.8109 km ENE of Atka, Alaska · 3655 days ago · 179 km deep · 30 km away
  2. 3.070 km ENE of Atka, Alaska · 3657 days ago · 124 km deep · 66 km away
  3. 1.850 km ENE of Atka, Alaska · 3660 days ago · 21 km deep · 87 km away
  4. 2.744 km ENE of Atka, Alaska · 3673 days ago · 177 km deep · 91 km away
  5. 2.564 km NE of Atka, Alaska · 3678 days ago · 114 km deep · 70 km away
  6. 2.156 km ENE of Atka, Alaska · 3681 days ago · 18 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20007cpt. Read Sun, Oct 4, 2026, 10:55 PM UTC.