M4.6 earthquake 99 km NNE of Hihifo, Tonga
A magnitude 4.6 earthquake struck 99 km NNE of Hihifo, Tonga on Sun, Mar 9, 1975, 6:02 AM GMT-11 (17:02 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.7 81 km NE of Hihifo, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1975-03-09 17:02:16 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 15.186° S, 173.320° 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.
- Stations used
- 17
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.781 km NE of Hihifo, Tonga · 18819 days ago · 15 km deep · 31 km away
- 4.3124 km ENE of Hihifo, Tonga · 18815 days ago · 33 km deep · 63 km away
- 4.6109 km NE of Hihifo, Tonga · 18809 days ago · 33 km deep · 46 km away
- 4.9107 km NNE of Hihifo, Tonga · 18786 days ago · 33 km deep · 36 km away
- 4.576 km NNE of Hihifo, Tonga · 18775 days ago · 33 km deep · 26 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000a60. Read Tue, Sep 22, 2026, 11:15 AM UTC.