M6.1 earthquake 275 km SSW of ‘Ohonua, Tonga
A magnitude 6.1 earthquake struck 275 km SSW of ‘Ohonua, Tonga on Sun, Aug 21, 1966, 11:55 AM GMT+13 (22:55 UTC), 43 km (26 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.1 (mw), strong
- Local time
- UTC
- 1966-08-20 22:55:02 UTC
- Depth
- 42.6 km (26.5 mi), shallow
- Epicenter
- 23.719° S, 175.734° 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
- ±0.40
- 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: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.6278 km S of ‘Ohonua, Tonga · 21923 days ago · 22 km deep · 31 km away
- 5.9255 km SSW of ‘Ohonua, Tonga · 21922 days ago · 44 km deep · 23 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem844758. Read Tue, Sep 22, 2026, 3:36 AM UTC.