Alaska earthquakes

M4.6 earthquake 103 km WSW of Adak, Alaska

A magnitude 4.6 earthquake struck 103 km WSW of Adak, Alaska on Thu, Oct 1, 1998, 5:40 PM HADT (02:40 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.7 142 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.6 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1998-10-02 02:40:44 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.673° N, 178.095° 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 8 in the 30 days before it.

After

  1. 4.7142 km WSW of Adak, Alaska · 10225 days ago · 52 km deep · 41 km away
  2. 4.731 km SW of Adak, Alaska · 10216 days ago · 58 km deep · 81 km away
  3. 4.342 km S of Adak, Alaska · 10214 days ago · 67 km deep · 98 km away
  4. 4.523 km W of Adak, Alaska · 10208 days ago · 60 km deep · 80 km away
  5. 4.4184 km WSW of Adak, Alaska · 10193 days ago · 33 km deep · 81 km away
  6. 4.324 km SW of Adak, Alaska · 10190 days ago · 58 km deep · 85 km away
  7. 4.7115 km SW of Adak, Alaska · 10172 days ago · 33 km deep · 41 km away
  8. 4.5139 km WSW of Adak, Alaska · 10171 days ago · 33 km deep · 36 km away

Before

  1. 5.4Andreanof Islands, Aleutian Islands, Alaska · 10228 days ago · 33 km deep · 22 km away
  2. 4.1146 km WSW of Adak, Alaska · 10228 days ago · 33 km deep · 49 km away
  3. 4.1130 km WSW of Adak, Alaska · 10229 days ago · 33 km deep · 45 km away
  4. 4.6154 km W of Adak, Alaska · 10239 days ago · 33 km deep · 55 km away
  5. 5.2116 km WSW of Adak, Alaska · 10239 days ago · 33 km deep · 25 km away
  6. 4.9182 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 82 km away
  7. 4.3178 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 75 km away
  8. 4.270 km WNW of Adak, Alaska · 10247 days ago · 33 km deep · 63 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0008vv3. Read Fri, Oct 2, 2026, 9:17 AM UTC.