Alaska earthquakes

M4.5 earthquake 58 km SSW of Adak, Alaska

A magnitude 4.5 earthquake struck 58 km SSW of Adak, Alaska on Thu, Mar 19, 1998, 7:56 PM HAST (05:56 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.6 126 km WSW of Adak, 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
4.5 (Ms, surface-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1998-03-20 05:56:07 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.374° N, 176.878° 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 usp0008hr2. 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
OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.549 km SSW of Adak, Alaska · 10423 days ago · 33 km deep · 12 km away
  2. 4.424 km WSW of Adak, Alaska · 10419 days ago · 56 km deep · 51 km away
  3. 3.456 km E of Adak, Alaska · 10414 days ago · 33 km deep · 98 km away
  4. 4.6126 km WSW of Adak, Alaska · 10412 days ago · 33 km deep · 93 km away
  5. 3.876 km SSW of Adak, Alaska · 10411 days ago · 33 km deep · 26 km away
  6. 4.652 km SW of Adak, Alaska · 10394 days ago · 43 km deep · 33 km away
  7. 4.257 km SE of Adak, Alaska · 10393 days ago · 49 km deep · 65 km away
  8. 4.635 km SW of Adak, Alaska · 10388 days ago · 40 km deep · 29 km away
  9. 3.299 km SW of Adak, Alaska · 10384 days ago · 61 km deep · 57 km away
  10. 3.370 km S of Adak, Alaska · 10377 days ago · 33 km deep · 32 km away
  11. 4.2119 km WSW of Adak, Alaska · 10372 days ago · 33 km deep · 89 km away
  12. 4.3122 km SW of Adak, Alaska · 10366 days ago · 33 km deep · 82 km away

Before

  1. 4.440 km E of Adak, Alaska · 10444 days ago · 48 km deep · 82 km away
  2. 4.571 km SSW of Adak, Alaska · 10453 days ago · 33 km deep · 14 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0008hr2. Read Fri, Oct 2, 2026, 11:50 AM UTC.