M4.7 earthquake 186 km WSW of Adak, Alaska
A magnitude 4.7 earthquake struck 186 km WSW of Adak, Alaska on Mon, Feb 24, 1975, 10:20 AM GMT-10 (20:20 UTC), 59 km (37 mi) below the surface.
A larger quake followed: M5.4 211 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
- 4.7 (mb), light
- Local time
- UTC
- 1975-02-24 20:20:08 UTC
- Depth
- 59.0 km (36.7 mi), shallow
- Epicenter
- 51.411° N, 179.227° 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
- 27
Nearby
Within 100 km, magnitude 1.7 and up: 5 in the 60 days after this one and 8 in the 30 days before it.
After
- 4.3205 km WSW of Adak, Alaska · 18822 days ago · 63 km deep · 44 km away
- 4.9218 km WSW of Adak, Alaska · 18821 days ago · 53 km deep · 32 km away
- 5.4211 km WSW of Adak, Alaska · 18821 days ago · 57 km deep · 25 km away
- 4.1224 km WSW of Adak, Alaska · 18820 days ago · 56 km deep · 39 km away
- 4.9117 km WSW of Adak, Alaska · 18808 days ago · 62 km deep · 69 km away
Before
- 4.4192 km W of Adak, Alaska · 18845 days ago · 59 km deep · 30 km away
- 5.0194 km WSW of Adak, Alaska · 18846 days ago · 50 km deep · 16 km away
- 5.0201 km WSW of Adak, Alaska · 18846 days ago · 55 km deep · 15 km away
- 5.1197 km WSW of Adak, Alaska · 18847 days ago · 62 km deep · 12 km away
- 4.8205 km WSW of Adak, Alaska · 18847 days ago · 46 km deep · 19 km away
- 4.2213 km WSW of Adak, Alaska · 18847 days ago · 47 km deep · 33 km away
- 4.3211 km WSW of Adak, Alaska · 18847 days ago · 52 km deep · 25 km away
- 6.5200 km WSW of Adak, Alaska · 18847 days ago · 48 km deep · 14 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000a0x. Read Tue, Sep 29, 2026, 11:28 AM UTC.