M5.5 earthquake 101 km S of Attu Station, Alaska
A magnitude 5.5 earthquake struck 101 km S of Attu Station, Alaska on Tue, Jul 13, 1971, 3:49 AM GMT+12 (15:49 UTC), 24 km (15 mi) below the surface.
A larger quake followed: M6.4 81 km S of Attu Station, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mw), moderate
- Local time
- UTC
- 1971-07-12 15:49:12 UTC
- Depth
- 23.7 km (14.7 mi), shallow
- Epicenter
- 51.938° N, 173.198° E
- 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
- ±0.29
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 2 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 iscgem782142. Read Tue, Sep 22, 2026, 9:16 AM UTC.