M5.3 earthquake 166 km SSW of ‘Ohonua, Tonga
A magnitude 5.3 earthquake struck 166 km SSW of ‘Ohonua, Tonga on Thu, Apr 17, 1975, 3:07 AM GMT+13 (14:07 UTC), 38 km (24 mi) below the surface.
A larger quake followed: M5.6 228 km SW 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
- 5.3 (ms), moderate
- Local time
- UTC
- 1975-04-16 14:07:59 UTC
- Depth
- 38.0 km (23.6 mi), shallow
- Epicenter
- 22.796° S, 175.334° 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
- CONSTRAINED_BY_DEPTH_PHASES
- Stations used
- 52
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.3 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 5.1166 km S of ‘Ohonua, Tonga · 18787 days ago · 33 km deep · 13 km away
- 5.6228 km SW of ‘Ohonua, Tonga · 18768 days ago · 90 km deep · 96 km away
- 4.3199 km S of ‘Ohonua, Tonga · 18763 days ago · 64 km deep · 36 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000an4 (also filed as iscgem730198). Read Tue, Sep 22, 2026, 9:35 PM UTC.