Alaska earthquakes

M3.6 earthquake 118 km NE of Atka, Alaska

A magnitude 3.6 earthquake struck 118 km NE of Atka, Alaska on Thu, Sep 21, 2017, 2:19 AM HADT (11:19 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M4.0 60 km E 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
3.6 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2017-09-21 11:19:57 UTC
Depth
22.0 km (13.7 mi), shallow
Epicenter
52.807° N, 172.775° 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 12.4 km horizontally, 13.6 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
177°
Stations used
36

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 3.181 km ENE of Atka, Alaska · 3296 days ago · 183 km deep · 40 km away
  2. 2.958 km E of Atka, Alaska · 3261 days ago · 179 km deep · 77 km away
  3. 4.060 km E of Atka, Alaska · 3257 days ago · 63 km deep · 87 km away
  4. 1.952 km ESE of Atka, Alaska · 3255 days ago · 67 km deep · 94 km away
  5. 1.866 km ESE of Atka, Alaska · 3255 days ago · 62 km deep · 92 km away
  6. 3.037 km ENE of Atka, Alaska · 3250 days ago · 194 km deep · 82 km away
  7. 3.2138 km E of Atka, Alaska · 3244 days ago · 71 km deep · 76 km away
  8. 2.141 km E of Atka, Alaska · 3243 days ago · 1 km deep · 92 km away
  9. 3.743 km NNE of Atka, Alaska · 3239 days ago · 177 km deep · 86 km away
  10. 2.3106 km ESE of Atka, Alaska · 3238 days ago · 62 km deep · 99 km away

Before

  1. 3.4100 km ENE of Atka, Alaska · 3307 days ago · 220 km deep · 19 km away
  2. 4.150 km ENE of Atka, Alaska · 3307 days ago · 66 km deep · 75 km away
  3. 3.470 km ENE of Atka, Alaska · 3309 days ago · 96 km deep · 48 km away
  4. 2.840 km ESE of Atka, Alaska · 3315 days ago · 168 km deep · 97 km away
  5. 3.4170 km E of Atka, Alaska · 3319 days ago · 25 km deep · 100 km away
  6. 2.045 km E of Atka, Alaska · 3322 days ago · 13 km deep · 89 km away
  7. 2.945 km E of Atka, Alaska · 3325 days ago · 174 km deep · 82 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000awpp. Read Fri, Oct 2, 2026, 5:49 AM UTC.