Alaska earthquakes

M4.1 earthquake 277 km WSW of Adak, Alaska

A magnitude 4.1 earthquake struck 277 km WSW of Adak, Alaska on Sat, Apr 18, 1998, 8:40 AM GMT+12 (20:40 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.5 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.1 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1998-04-17 20:40:35 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.303° N, 179.466° E
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: 10 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 3.4Rat Islands, Aleutian Islands, Alaska · 10389 days ago · 57 km deep · 71 km away
  2. 3.7293 km WSW of Adak, Alaska · 10388 days ago · 33 km deep · 22 km away
  3. 3.7249 km W of Adak, Alaska · 10367 days ago · 100 km deep · 53 km away
  4. 4.4Rat Islands, Aleutian Islands, Alaska · 10356 days ago · 33 km deep · 58 km away
  5. 4.5Rat Islands, Aleutian Islands, Alaska · 10349 days ago · 45 km deep · 65 km away
  6. 4.2296 km WSW of Adak, Alaska · 10346 days ago · 33 km deep · 32 km away
  7. 3.6284 km W of Adak, Alaska · 10342 days ago · 61 km deep · 72 km away
  8. 3.6192 km WSW of Adak, Alaska · 10342 days ago · 33 km deep · 85 km away
  9. 4.2278 km WSW of Adak, Alaska · 10339 days ago · 66 km deep · 17 km away
  10. 4.1274 km WSW of Adak, Alaska · 10339 days ago · 61 km deep · 9 km away

Before

  1. 4.6291 km WSW of Adak, Alaska · 10410 days ago · 33 km deep · 14 km away
  2. 4.6287 km WSW of Adak, Alaska · 10410 days ago · 33 km deep · 13 km away
  3. 4.0Rat Islands, Aleutian Islands, Alaska · 10414 days ago · 40 km deep · 55 km away
  4. 4.3Rat Islands, Aleutian Islands, Alaska · 10414 days ago · 43 km deep · 51 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0008kf1. Read Fri, Oct 2, 2026, 9:18 AM UTC.