M5.6 earthquake 77 km ESE of ‘Ohonua, Tonga
A magnitude 5.6 earthquake struck 77 km ESE of ‘Ohonua, Tonga on Thu, Sep 29, 1977, 1:12 AM GMT+13 (12:12 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mb), moderate
- Local time
- UTC
- 1977-09-28 12:12:10 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 21.517° S, 174.230° 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.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 111
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 2 in the 30 days before it.
After
- 5.5111 km SSE of Pangai, Tonga · 17870 days ago · 33 km deep · 90 km away
- 4.7135 km SE of ‘Ohonua, Tonga · 17836 days ago · 33 km deep · 76 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000qua (also filed as iscgem693874). Read Tue, Sep 22, 2026, 10:51 AM UTC.