M5.4 earthquake 178 km WNW of Attu Station, Alaska
A magnitude 5.4 earthquake struck 178 km WNW of Attu Station, Alaska on Fri, Apr 30, 1971, 2:26 AM GMT+11 (15:26 UTC), 29 km (18 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.4 (mw), moderate
- Local time
- UTC
- 1971-04-29 15:26:36 UTC
- Depth
- 29.4 km (18.3 mi), shallow
- Epicenter
- 53.199° N, 170.593° 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
- ±0.21
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.4 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem786021. Read Tue, Sep 22, 2026, 7:39 PM UTC.