Alaska earthquakes

M4.9 earthquake 216 km WSW of Adak, Alaska

A magnitude 4.9 earthquake struck 216 km WSW of Adak, Alaska on Thu, Sep 18, 1997, 12:10 AM HADT (09:10 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.6 212 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.9 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1997-09-18 09:10:33 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.164° N, 179.544° 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 1.9 and up: 5 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 5.6212 km WSW of Adak, Alaska · 10605 days ago · 33 km deep · 4 km away
  2. 4.6136 km WSW of Adak, Alaska · 10581 days ago · 33 km deep · 81 km away
  3. 4.1156 km WSW of Adak, Alaska · 10557 days ago · 33 km deep · 61 km away
  4. 4.4146 km WSW of Adak, Alaska · 10554 days ago · 33 km deep · 71 km away
  5. 4.7117 km WSW of Adak, Alaska · 10553 days ago · 33 km deep · 99 km away

Before

  1. 4.9Andreanof Islands, Aleutian Islands, Alaska · 10609 days ago · 53 km deep · 90 km away
  2. 4.1Rat Islands, Aleutian Islands, Alaska · 10619 days ago · 33 km deep · 92 km away
  3. 4.3224 km WSW of Adak, Alaska · 10620 days ago · 60 km deep · 17 km away
  4. 4.7139 km SW of Adak, Alaska · 10623 days ago · 33 km deep · 87 km away
  5. 4.1134 km WSW of Adak, Alaska · 10624 days ago · 33 km deep · 82 km away
  6. 3.9272 km WSW of Adak, Alaska · 10625 days ago · 33 km deep · 68 km away
  7. 3.9141 km WSW of Adak, Alaska · 10629 days ago · 33 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00087p9. Read Thu, Oct 1, 2026, 7:12 PM UTC.