M4.7 earthquake 261 km S of ‘Ohonua, Tonga
A magnitude 4.7 earthquake struck 261 km S of ‘Ohonua, Tonga on Wed, Mar 26, 1975, 2:37 AM GMT+13 (13:37 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.6 187 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
- 4.7 (Ms, surface-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1975-03-25 13:37:05 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 23.686° S, 175.164° 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
- 12
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 0 in the 30 days before it.
After
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000ac6. Read Thu, Oct 1, 2026, 11:53 AM UTC.