M6.3 earthquake 134 km SW of Adak, Alaska
A magnitude 6.3 earthquake struck 134 km SW of Adak, Alaska on Wed, Aug 2, 1972, 6:40 PM GMT-10 (04:40 UTC), 30 km (19 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.3 (mw), strong
- Local time
- UTC
- 1972-08-03 04:40:55 UTC
- Depth
- 30.3 km (18.8 mi), shallow
- Epicenter
- 51.111° N, 178.135° W
- Region
- Alaska
- Strongest shaking
- V, moderate shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- V, moderate shaking
- Peak ground acceleration
- 5.6% of gravity
- Peak ground velocity
- 1.5 cm/s
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Magnitude uncertainty
- ±0.21
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 4 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem770175 (also filed as ushis3197). Read Tue, Sep 22, 2026, 8:56 PM UTC.