Alaska earthquakes

M4.3 earthquake 205 km WSW of Adak, Alaska

A magnitude 4.3 earthquake struck 205 km WSW of Adak, Alaska on Wed, Mar 19, 1975, 6:36 AM GMT-10 (16:36 UTC), 63 km (39 mi) below the surface.

A larger quake followed: M4.9 218 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.3 (mb), light
Local time
UTC
1975-03-19 16:36:25 UTC
Depth
63.0 km (39.1 mi), shallow
Epicenter
51.019° N, 179.258° 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
15

Nearby

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 4.9218 km WSW of Adak, Alaska · 18814 days ago · 53 km deep · 37 km away
  2. 5.4211 km WSW of Adak, Alaska · 18814 days ago · 57 km deep · 40 km away
  3. 4.1224 km WSW of Adak, Alaska · 18813 days ago · 56 km deep · 36 km away
  4. 4.9117 km WSW of Adak, Alaska · 18801 days ago · 62 km deep · 95 km away
  5. 5.2258 km WSW of Adak, Alaska · 18773 days ago · 48 km deep · 84 km away
  6. 4.2161 km SW of Adak, Alaska · 18766 days ago · 33 km deep · 57 km away
  7. 4.8282 km SW of Adak, Alaska · 18765 days ago · 33 km deep · 89 km away

Before

  1. 4.7186 km WSW of Adak, Alaska · 18838 days ago · 59 km deep · 44 km away
  2. 4.4192 km W of Adak, Alaska · 18838 days ago · 59 km deep · 71 km away
  3. 5.0194 km WSW of Adak, Alaska · 18839 days ago · 50 km deep · 28 km away
  4. 5.0201 km WSW of Adak, Alaska · 18840 days ago · 55 km deep · 38 km away
  5. 5.1197 km WSW of Adak, Alaska · 18840 days ago · 62 km deep · 34 km away
  6. 4.8205 km WSW of Adak, Alaska · 18840 days ago · 46 km deep · 46 km away
  7. 4.2213 km WSW of Adak, Alaska · 18840 days ago · 47 km deep · 24 km away
  8. 4.3211 km WSW of Adak, Alaska · 18840 days ago · 52 km deep · 39 km away
  9. 6.5200 km WSW of Adak, Alaska · 18840 days ago · 48 km deep · 41 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000aac. Read Tue, Sep 22, 2026, 3:38 PM UTC.