M5.6 earthquake 187 km S of ‘Ohonua, Tonga
A magnitude 5.6 earthquake struck 187 km S of ‘Ohonua, Tonga on Wed, Apr 2, 1975, 11:31 PM GMT+13 (10:31 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1975-04-02 10:31:32 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 23.022° S, 175.112° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.6 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.59 | Mw, moment | ISC-GEM global catalog | Final · ±0.2 |
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
- 73
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.6 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 5.3166 km SSW of ‘Ohonua, Tonga · 18796 days ago · 38 km deep · 34 km away
- 5.1166 km S of ‘Ohonua, Tonga · 18795 days ago · 33 km deep · 24 km away
- 4.3199 km S of ‘Ohonua, Tonga · 18771 days ago · 64 km deep · 19 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000af5 (also filed as iscgem729680). Read Thu, Oct 1, 2026, 2:53 AM UTC.