M4.7 earthquake 81 km NE of Hihifo, Tonga
A magnitude 4.7 earthquake struck 81 km NE of Hihifo, Tonga on Sat, Mar 15, 1975, 6:54 AM GMT-11 (17:54 UTC), 15 km (9 mi) below the surface.
A larger quake followed: M4.9 107 km NNE 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
- 4.7 (mb), light
- Local time
- UTC
- 1975-03-15 17:54:53 UTC
- Depth
- 15.0 km (9.3 mi), shallow
- Epicenter
- 15.457° S, 173.241° 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
- 24
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.3124 km ENE of Hihifo, Tonga · 18815 days ago · 33 km deep · 50 km away
- 4.6109 km NE of Hihifo, Tonga · 18809 days ago · 33 km deep · 32 km away
- 4.9107 km NNE of Hihifo, Tonga · 18786 days ago · 33 km deep · 63 km away
- 4.576 km NNE of Hihifo, Tonga · 18775 days ago · 33 km deep · 34 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000a8g. Read Tue, Sep 22, 2026, 9:20 AM UTC.