M4.8 earthquake 237 km WSW of Adak, Alaska
A magnitude 4.8 earthquake struck 237 km WSW of Adak, Alaska on Sun, Apr 22, 1973, 9:42 AM GMT-12 (21:42 UTC), 54 km (34 mi) below the surface.
A larger quake followed: M5.3 207 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
- 4.8 (mb), light
- Local time
- UTC
- 1973-04-22 21:42:16 UTC
- Depth
- 54.0 km (33.6 mi), shallow
- Epicenter
- 51.129° N, 179.841° 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
- 45
Nearby
Within 100 km, magnitude 1.8 and up: 10 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.0248 km WSW of Adak, Alaska · 19511 days ago · 45 km deep · 19 km away
- 4.1248 km WSW of Adak, Alaska · 19510 days ago · 42 km deep · 14 km away
- 3.7186 km SW of Adak, Alaska · 19504 days ago · 33 km deep · 88 km away
- 5.3207 km WSW of Adak, Alaska · 19493 days ago · 61 km deep · 35 km away
- 5.8222 km WSW of Adak, Alaska · 19477 days ago · 39 km deep · 28 km away
- 4.9221 km WSW of Adak, Alaska · 19477 days ago · 56 km deep · 20 km away
- 4.1239 km WSW of Adak, Alaska · 19474 days ago · 46 km deep · 7 km away
- 5.8201 km WSW of Adak, Alaska · 19457 days ago · 48 km deep · 37 km away
- 5.4204 km WSW of Adak, Alaska · 19457 days ago · 50 km deep · 33 km away
- 4.4190 km WSW of Adak, Alaska · 19456 days ago · 51 km deep · 50 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00001gw. Read Tue, Sep 22, 2026, 9:42 AM UTC.