M6.0 earthquake 130 km SSW of Adak, Alaska
A magnitude 6.0 earthquake struck 130 km SSW of Adak, Alaska on Sun, Mar 20, 1927, 5:13 AM GMT-11 (16:13 UTC), 25 km (16 mi) below the surface.
A larger quake followed: M6.5 144 km SW 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
- 6.0 (mw), strong
- Local time
- UTC
- 1927-03-20 16:13:22 UTC
- Depth
- 25.0 km (15.5 mi), shallow
- Epicenter
- 50.824° N, 177.460° 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.
- Magnitude uncertainty
- ±0.20
- Depth from
- From location
Nearby
Within 100 km, magnitude 3.0 and up: 1 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 iscgem909154. Read Tue, Sep 29, 2026, 7:34 PM UTC.