Alaska earthquakes

M4.6 earthquake 154 km W of Adak, Alaska

A magnitude 4.6 earthquake struck 154 km W of Adak, Alaska on Sun, Sep 20, 1998, 7:18 AM HADT (16:18 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.4 Andreanof Islands, Aleutian Islands, 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
4.6 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1998-09-20 16:18:43 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.797° N, 178.870° 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

Nearby

Within 100 km, magnitude 1.6 and up: 8 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.1130 km WSW of Adak, Alaska · 10229 days ago · 33 km deep · 72 km away
  2. 4.1146 km WSW of Adak, Alaska · 10229 days ago · 33 km deep · 54 km away
  3. 5.4Andreanof Islands, Aleutian Islands, Alaska · 10228 days ago · 33 km deep · 60 km away
  4. 4.6103 km WSW of Adak, Alaska · 10227 days ago · 33 km deep · 55 km away
  5. 4.7142 km WSW of Adak, Alaska · 10226 days ago · 52 km deep · 42 km away
  6. 4.4184 km WSW of Adak, Alaska · 10194 days ago · 33 km deep · 39 km away
  7. 5.1235 km WSW of Adak, Alaska · 10190 days ago · 33 km deep · 89 km away
  8. 4.5230 km WSW of Adak, Alaska · 10189 days ago · 33 km deep · 82 km away

Before

  1. 5.2116 km WSW of Adak, Alaska · 10239 days ago · 33 km deep · 61 km away
  2. 4.9182 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 60 km away
  3. 4.3178 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 41 km away
  4. 4.270 km WNW of Adak, Alaska · 10248 days ago · 33 km deep · 97 km away
  5. 4.3131 km SW of Adak, Alaska · 10258 days ago · 33 km deep · 83 km away
  6. 4.0235 km WSW of Adak, Alaska · 10262 days ago · 33 km deep · 92 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0008v8j. Read Fri, Oct 2, 2026, 2:04 PM UTC.