Alaska earthquakes

M4.9 earthquake 218 km WSW of Adak, Alaska

A magnitude 4.9 earthquake struck 218 km WSW of Adak, Alaska on Wed, Mar 19, 1975, 9:11 PM GMT-10 (07:11 UTC), 53 km (33 mi) below the surface.

A larger quake followed: M5.4 211 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1975-03-20 07:11:35 UTC
Depth
53.0 km (32.9 mi), shallow
Epicenter
51.260° N, 179.625° 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.

Stations used
55

Nearby

Within 100 km, magnitude 1.9 and up: 4 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 5.4211 km WSW of Adak, Alaska · 18814 days ago · 57 km deep · 8 km away
  2. 4.1224 km WSW of Adak, Alaska · 18813 days ago · 56 km deep · 8 km away
  3. 5.2258 km WSW of Adak, Alaska · 18773 days ago · 48 km deep · 49 km away
  4. 4.2161 km SW of Adak, Alaska · 18766 days ago · 33 km deep · 88 km away

Before

  1. 4.3205 km WSW of Adak, Alaska · 18815 days ago · 63 km deep · 37 km away
  2. 4.7186 km WSW of Adak, Alaska · 18838 days ago · 59 km deep · 32 km away
  3. 4.4192 km W of Adak, Alaska · 18838 days ago · 59 km deep · 47 km away
  4. 5.0194 km WSW of Adak, Alaska · 18839 days ago · 50 km deep · 25 km away
  5. 5.0201 km WSW of Adak, Alaska · 18839 days ago · 55 km deep · 17 km away
  6. 5.1197 km WSW of Adak, Alaska · 18839 days ago · 62 km deep · 21 km away
  7. 4.8205 km WSW of Adak, Alaska · 18840 days ago · 46 km deep · 18 km away
  8. 4.2213 km WSW of Adak, Alaska · 18840 days ago · 47 km deep · 13 km away
  9. 4.3211 km WSW of Adak, Alaska · 18840 days ago · 52 km deep · 8 km away
  10. 6.5200 km WSW of Adak, Alaska · 18840 days ago · 48 km deep · 19 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000aam. Read Tue, Sep 22, 2026, 9:10 AM UTC.