Alaska earthquakes

M4.9 earthquake 50 km WSW of Adak, Alaska

A magnitude 4.9 earthquake struck 50 km WSW of Adak, Alaska on Thu, Aug 6, 1998, 6:22 AM HADT (15:22 UTC), 45 km (28 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
4.9 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1998-08-06 15:22:48 UTC
Depth
44.6 km (27.7 mi), shallow
Epicenter
51.660° N, 177.280° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

What happened

The USGS’s account of the effects of this earthquake.

Felt on Adak.

From the USGS event page for usp0008sve. U.S. Geological Survey text and figures are in the public domain.

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
CONSTRAINED_BY_DEPTH_PHASES

Nearby

Within 100 km, magnitude 1.9 and up: 14 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.321 km SSE of Adak, Alaska · 10265 days ago · 61 km deep · 54 km away
  2. 3.649 km N of Adak, Alaska · 10265 days ago · 47 km deep · 83 km away
  3. 4.589 km SSE of Adak, Alaska · 10263 days ago · 33 km deep · 96 km away
  4. 4.787 km SSE of Adak, Alaska · 10262 days ago · 33 km deep · 98 km away
  5. 4.588 km SSE of Adak, Alaska · 10262 days ago · 33 km deep · 98 km away
  6. 4.172 km SSE of Adak, Alaska · 10260 days ago · 33 km deep · 81 km away
  7. 4.3131 km SW of Adak, Alaska · 10258 days ago · 33 km deep · 82 km away
  8. 4.270 km WNW of Adak, Alaska · 10247 days ago · 33 km deep · 57 km away
  9. 5.2116 km WSW of Adak, Alaska · 10239 days ago · 33 km deep · 66 km away
  10. 4.1130 km WSW of Adak, Alaska · 10229 days ago · 33 km deep · 79 km away
  11. 4.1146 km WSW of Adak, Alaska · 10228 days ago · 33 km deep · 96 km away
  12. 5.4Andreanof Islands, Aleutian Islands, Alaska · 10228 days ago · 33 km deep · 64 km away
  13. 4.6103 km WSW of Adak, Alaska · 10227 days ago · 33 km deep · 56 km away
  14. 4.7142 km WSW of Adak, Alaska · 10225 days ago · 52 km deep · 92 km away

Before

  1. 4.2143 km WSW of Adak, Alaska · 10288 days ago · 33 km deep · 94 km away
  2. 4.3112 km WSW of Adak, Alaska · 10291 days ago · 33 km deep · 63 km away
  3. 3.458 km S of Adak, Alaska · 10312 days ago · 33 km deep · 60 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0008sve. Read Fri, Oct 2, 2026, 6:08 AM UTC.