M4.8 earthquake 56 km NE of ‘Ohonua, Tonga
A magnitude 4.8 earthquake struck 56 km NE of ‘Ohonua, Tonga on Wed, Aug 13, 1975, 1:42 PM GMT+13 (00:42 UTC), 109 km (68 mi) below the surface.
A larger quake followed: M5.4 39 km E 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
- 4.8 (mb), light
- Local time
- UTC
- 1975-08-13 00:42:36 UTC
- Depth
- 109.0 km (67.7 mi), intermediate-depth
- Epicenter
- 20.997° S, 174.540° 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
- 35
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.439 km E of ‘Ohonua, Tonga · 18635 days ago · 31 km deep · 33 km away
- 6.588 km SSE of Pangai, Tonga · 18627 days ago · 33 km deep · 77 km away
- 4.585 km SE of Pangai, Tonga · 18619 days ago · 33 km deep · 95 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000cex. Read Wed, Sep 23, 2026, 3:34 AM UTC.