M4.6 earthquake 278 km S of ‘Ohonua, Tonga
A magnitude 4.6 earthquake struck 278 km S of ‘Ohonua, Tonga on Tue, Sep 18, 1973, 4:31 AM GMT+13 (15:31 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
- 4.6 (mb), light
- Local time
- UTC
- 1973-09-17 15:31:37 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 23.830° S, 175.235° 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
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 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 usp00003f9. Read Tue, Sep 22, 2026, 3:09 PM UTC.