Alaska earthquakes

M4.1 earthquake 146 km WSW of Adak, Alaska

A magnitude 4.1 earthquake struck 146 km WSW of Adak, Alaska on Wed, Sep 30, 1998, 2:18 PM HADT (23:18 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
4.1 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1998-09-30 23:18:48 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.344° N, 178.572° 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 1.5 and up: 8 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 5.4Andreanof Islands, Aleutian Islands, Alaska · 10228 days ago · 33 km deep · 32 km away
  2. 4.6103 km WSW of Adak, Alaska · 10227 days ago · 33 km deep · 49 km away
  3. 4.7142 km WSW of Adak, Alaska · 10225 days ago · 52 km deep · 13 km away
  4. 4.4184 km WSW of Adak, Alaska · 10193 days ago · 33 km deep · 52 km away
  5. 5.1235 km WSW of Adak, Alaska · 10189 days ago · 33 km deep · 94 km away
  6. 4.5230 km WSW of Adak, Alaska · 10189 days ago · 33 km deep · 91 km away
  7. 4.7115 km SW of Adak, Alaska · 10172 days ago · 33 km deep · 38 km away
  8. 4.5139 km WSW of Adak, Alaska · 10171 days ago · 33 km deep · 28 km away

Before

  1. 4.1130 km WSW of Adak, Alaska · 10229 days ago · 33 km deep · 24 km away
  2. 4.6154 km W of Adak, Alaska · 10239 days ago · 33 km deep · 54 km away
  3. 5.2116 km WSW of Adak, Alaska · 10239 days ago · 33 km deep · 30 km away
  4. 4.9182 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 37 km away
  5. 4.3178 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 41 km away
  6. 4.3131 km SW of Adak, Alaska · 10258 days ago · 33 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0008vst. Read Fri, Oct 2, 2026, 8:31 AM UTC.