Alaska earthquakes

M4.9 earthquake 86 km WSW of Atka, Alaska

A magnitude 4.9 earthquake struck 86 km WSW of Atka, Alaska on Mon, Sep 22, 1997, 10:30 PM HADT (07:30 UTC), 56 km (35 mi) below the surface.

A larger quake followed: M5.2 87 km E 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
1997-09-23 07:30:27 UTC
Depth
56.3 km (35.0 mi), shallow
Epicenter
51.855° N, 175.326° 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.

Nearby

Within 100 km, magnitude 1.9 and up: 5 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 5.287 km E of Adak, Alaska · 10590 days ago · 62 km deep · 3 km away
  2. 4.991 km S of Atka, Alaska · 10587 days ago · 33 km deep · 79 km away
  3. 4.571 km ESE of Adak, Alaska · 10569 days ago · 33 km deep · 42 km away
  4. 4.555 km SSE of Adak, Alaska · 10566 days ago · 33 km deep · 88 km away
  5. 5.242 km ESE of Adak, Alaska · 10546 days ago · 51 km deep · 49 km away

Before

  1. 4.555 km SSE of Adak, Alaska · 10606 days ago · 33 km deep · 74 km away
  2. 4.254 km NNW of Atka, Alaska · 10611 days ago · 180 km deep · 100 km away
  3. 4.061 km E of Adak, Alaska · 10614 days ago · 53 km deep · 31 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00087wk. Read Thu, Oct 1, 2026, 11:58 PM UTC.