M4.8 earthquake 234 km SW of ‘Ohonua, Tonga
A magnitude 4.8 earthquake struck 234 km SW of ‘Ohonua, Tonga on Thu, Aug 4, 1977, 12:00 AM GMT+13 (11:00 UTC), 115 km (71 mi) below the surface.
A larger quake followed: M5.1 141 km SW of Vaini, 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
- 1977-08-03 11:00:25 UTC
- Depth
- 115.0 km (71.5 mi), intermediate-depth
- Epicenter
- 23.041° S, 176.299° 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
- 40
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 5.1141 km SW of Vaini, Tonga · 17944 days ago · 122 km deep · 97 km away
- 4.5144 km SW of Vaini, Tonga · 17938 days ago · 170 km deep · 100 km away
- 4.9160 km SW of ‘Ohonua, Tonga · 17938 days ago · 33 km deep · 75 km away
- 5.3224 km SSW of ‘Ohonua, Tonga · 17935 days ago · 33 km deep · 99 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000pz0. Read Tue, Sep 22, 2026, 10:28 AM UTC.