M5.8 earthquake 109 km WSW of Adak, Alaska
A magnitude 5.8 earthquake struck 109 km WSW of Adak, Alaska on Mon, Aug 12, 1974, 5:46 PM GMT-10 (03:46 UTC), 52 km (32 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.8 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1974-08-13 03:46:20 UTC
- Depth
- 52.0 km (32.3 mi), shallow
- Epicenter
- 51.525° N, 178.112° 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 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed |
| 6.13 | Mw, moment | ISC-GEM global catalog | Final · ±0.2 |
| 5.8 | mb, body-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) V
From the USGS event page for usp00007km. 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
- 163
Nearby
Within 100 km, magnitude 2.8 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.7110 km WSW of Adak, Alaska · 19041 days ago · 56 km deep · 5 km away
- 5.892 km WSW of Adak, Alaska · 19039 days ago · 46 km deep · 20 km away
- 4.0138 km W of Adak, Alaska · 19030 days ago · 66 km deep · 38 km away
- 4.4151 km W of Adak, Alaska · 19027 days ago · 36 km deep · 68 km away
- 4.3174 km WSW of Adak, Alaska · 18994 days ago · 53 km deep · 66 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00007km (also filed as ushis3288, iscgem738675). Read Thu, Oct 1, 2026, 5:00 AM UTC.