M4.2 earthquake 129 km SSE of Hihifo, Tonga
A magnitude 4.2 earthquake struck 129 km SSE of Hihifo, Tonga on Tue, Oct 28, 1975, 6:31 PM GMT-12 (06:31 UTC), 214 km (133 mi) below the surface.
A larger quake followed: M5.7 189 km SE 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
- 4.2 (mb), light
- Local time
- UTC
- 1975-10-29 06:31:04 UTC
- Depth
- 214.0 km (133.0 mi), intermediate-depth
- Epicenter
- 17.086° S, 173.506° 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
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 5.7189 km SE of Hihifo, Tonga · 18595 days ago · 33 km deep · 92 km away
- 4.1141 km NE of Neiafu, Tonga · 18572 days ago · 33 km deep · 87 km away
- 5.086 km NNE of Neiafu, Tonga · 18549 days ago · 34 km deep · 97 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000db5. Read Tue, Sep 29, 2026, 11:52 PM UTC.