M5.8 earthquake 92 km WSW of Adak, Alaska
A magnitude 5.8 earthquake struck 92 km WSW of Adak, Alaska on Thu, Aug 15, 1974, 11:41 PM GMT-10 (09:41 UTC), 46 km (29 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.8 (Ms, surface-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1974-08-16 09:41:31 UTC
- Depth
- 46.0 km (28.6 mi), shallow
- Epicenter
- 51.498° N, 177.828° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.8 | Ms, surface-wave | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.98 | Mw, moment | ISC-GEM global catalog | Final · ±0.2 |
| 5.8 | Ms, surface-wave | USGS historic United States catalog | Final |
What happened
The USGS’s account of the effects of this earthquake.
Maximum observed Modified Mercalli Intensity (MMI) IV
From the USGS event page for usp00007nb. U.S. Geological Survey text and figures are in the public domain.
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
- 151
Nearby
Within 100 km, magnitude 2.8 and up: 3 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.0138 km W of Adak, Alaska · 19031 days ago · 66 km deep · 57 km away
- 4.4151 km W of Adak, Alaska · 19028 days ago · 36 km deep · 85 km away
- 4.3174 km WSW of Adak, Alaska · 18995 days ago · 53 km deep · 85 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00007nb (also filed as ushis3290, iscgem738844). Read Thu, Oct 1, 2026, 9:22 PM UTC.