M4.2 earthquake 209 km WSW of Adak, Alaska
A magnitude 4.2 earthquake struck 209 km WSW of Adak, Alaska on Thu, Mar 22, 1973, 10:24 AM GMT-11 (21:24 UTC), 51 km (32 mi) below the surface.
A larger quake followed: M5.0 134 km WSW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.2 (mb), light
- Local time
- UTC
- 1973-03-22 21:24:23 UTC
- Depth
- 51.0 km (31.7 mi), shallow
- Epicenter
- 51.116° N, 179.392° 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
- 22
Nearby
Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 4 in the 30 days before it.
After
- 5.0134 km WSW of Adak, Alaska · 19527 days ago · 50 km deep · 74 km away
- 3.8224 km W of Adak, Alaska · 19521 days ago · 111 km deep · 74 km away
- 5.5173 km WSW of Adak, Alaska · 19517 days ago · 54 km deep · 39 km away
- 3.9263 km WSW of Adak, Alaska · 19516 days ago · 66 km deep · 78 km away
- 4.8237 km WSW of Adak, Alaska · 19510 days ago · 54 km deep · 31 km away
- 4.0248 km WSW of Adak, Alaska · 19510 days ago · 45 km deep · 39 km away
- 4.1248 km WSW of Adak, Alaska · 19510 days ago · 42 km deep · 40 km away
- 3.7186 km SW of Adak, Alaska · 19504 days ago · 33 km deep · 60 km away
- 5.3207 km WSW of Adak, Alaska · 19493 days ago · 61 km deep · 30 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000115. Read Tue, Sep 22, 2026, 5:41 AM UTC.