Alaska earthquakes

M3.8 earthquake 198 km SSE of Unalaska, Alaska

A magnitude 3.8 earthquake struck 198 km SSE of Unalaska, Alaska on Fri, Aug 31, 2018, 3:32 AM AKDT (11:32 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.9 172 km SSE of Unalaska, 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
3.8 (mb), minor
Local time
UTC
2018-08-31 11:32:55 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
52.130° N, 165.944° 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 4.7 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.07
Depth from
Operator assigned
Station coverage gap
176°
Stations used
139

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 3.9172 km SSE of Unalaska, Alaska · 2949 days ago · 10 km deep · 52 km away
  2. 1.8south of the Aleutian Islands · 2949 days ago · 10 km deep · 79 km away
  3. 2.1200 km SSE of Unalaska, Alaska · 2947 days ago · 5 km deep · 38 km away
  4. 1.6124 km ESE of Nikolski, Alaska · 2946 days ago · 26 km deep · 98 km away
  5. 2.5194 km SE of Nikolski, Alaska · 2943 days ago · 19 km deep · 76 km away
  6. 1.8158 km ESE of Nikolski, Alaska · 2933 days ago · 25 km deep · 62 km away
  7. 1.9174 km SSE of Unalaska, Alaska · 2933 days ago · 23 km deep · 76 km away
  8. 2.1175 km SSE of Unalaska, Alaska · 2929 days ago · 13 km deep · 41 km away
  9. 2.0126 km ESE of Nikolski, Alaska · 2917 days ago · 11 km deep · 93 km away
  10. 3.3199 km SSE of Unalaska, Alaska · 2905 days ago · 25 km deep · 49 km away
  11. 3.5146 km ESE of Nikolski, Alaska · 2893 days ago · 24 km deep · 71 km away

Before

  1. 2.7123 km ESE of Nikolski, Alaska · 2955 days ago · 35 km deep · 99 km away
  2. 1.9147 km ESE of Nikolski, Alaska · 2957 days ago · 17 km deep · 72 km away
  3. 2.0147 km S of Unalaska, Alaska · 2961 days ago · 18 km deep · 66 km away
  4. 3.3152 km ESE of Nikolski, Alaska · 2980 days ago · 10 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000haem (also filed as ak20238675, ak018b62c2uh). Read Wed, Sep 30, 2026, 10:18 PM UTC.