M4.3 earthquake 169 km SSW of ‘Ohonua, Tonga
A magnitude 4.3 earthquake struck 169 km SSW of ‘Ohonua, Tonga on Tue, Sep 13, 1977, 4:23 PM GMT+13 (03:23 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.5 241 km S of ‘Ohonua, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1977-09-13 03:23:58 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 22.819° S, 175.348° 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
- 20
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.5241 km S of ‘Ohonua, Tonga · 17908 days ago · 15 km deep · 77 km away
- 4.8160 km SSW of ‘Ohonua, Tonga · 17893 days ago · 33 km deep · 48 km away
- 5.0168 km S of ‘Ohonua, Tonga · 17867 days ago · 33 km deep · 72 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000qmd. Read Thu, Oct 1, 2026, 10:59 PM UTC.