M6.1 earthquake 159 km WSW of Adak, Alaska
A magnitude 6.1 earthquake struck 159 km WSW of Adak, Alaska on Mon, Aug 1, 1927, 6:06 AM GMT-11 (17:06 UTC), 35 km (22 mi) below the surface.
A larger quake followed: M6.2 145 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
- 6.1 (Mw, moment), strong
- Magnitude from
- ISC-GEM global catalog
- Local time
- UTC
- 1927-08-01 17:06:07 UTC
- Depth
- 35.0 km (21.7 mi), shallow
- Epicenter
- 51.518° N, 178.865° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
Maximum observed Modified Mercalli Intensity (MMI) I
From the USGS event page for iscgem909420. 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.
- Magnitude uncertainty
- ±0.20
- Depth from
- From location
Nearby
Within 100 km, magnitude 3.1 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 iscgem909420 (also filed as ushis767). Read Fri, Oct 2, 2026, 11:37 PM UTC.