Alaska earthquakes

M4.6 earthquake 99 km SSW of Unalaska, Alaska

A magnitude 4.6 earthquake struck 99 km SSW of Unalaska, Alaska on Mon, Jun 4, 1979, 11:39 AM GMT-9 (20:39 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.1 117 km E 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
4.6 (mb), light
Local time
UTC
1979-06-04 20:39:01 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
53.044° N, 167.100° 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.

Depth from
OPERATOR_ASSIGNED
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.6 and up: 5 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 4.5104 km SSW of Unalaska, Alaska · 17276 days ago · 40 km deep · 6 km away
  2. 5.1117 km E of Nikolski, Alaska · 17255 days ago · 33 km deep · 23 km away
  3. 4.9126 km S of Unalaska, Alaska · 17254 days ago · 21 km deep · 36 km away
  4. 3.833 km WSW of Unalaska, Alaska · 17245 days ago · 33 km deep · 75 km away
  5. 4.1105 km S of Unalaska, Alaska · 17236 days ago · 33 km deep · 42 km away

Before

  1. 4.4126 km E of Nikolski, Alaska · 17292 days ago · 33 km deep · 33 km away
  2. 4.7118 km ESE of Nikolski, Alaska · 17293 days ago · 33 km deep · 40 km away
  3. 4.6116 km E of Nikolski, Alaska · 17294 days ago · 33 km deep · 20 km away
  4. 4.5120 km SSW of Unalaska, Alaska · 17294 days ago · 26 km deep · 29 km away
  5. 4.6114 km SSW of Unalaska, Alaska · 17295 days ago · 33 km deep · 16 km away
  6. 4.8169 km ESE of Nikolski, Alaska · 17295 days ago · 33 km deep · 96 km away
  7. 6.2129 km ESE of Nikolski, Alaska · 17295 days ago · 23 km deep · 48 km away
  8. 5.139 km ESE of Nikolski, Alaska · 17312 days ago · 39 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000113j. Read Wed, Sep 30, 2026, 7:37 AM UTC.