M5.5 earthquake 74 km WSW of Neiafu, Tonga
A magnitude 5.5 earthquake struck 74 km WSW of Neiafu, Tonga on Sat, Aug 28, 1971, 5:09 PM GMT+13 (04:09 UTC), 145 km (90 mi) below the surface.
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
- 1971-08-28 04:09:07 UTC
- Depth
- 144.6 km (89.9 mi), intermediate-depth
- Epicenter
- 19.013° S, 174.584° W
- Region
- Tonga
- 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
- ±0.36
- Depth from
- From location
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 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 iscgem781694. Read Tue, Sep 22, 2026, 7:05 AM UTC.