M4.9 earthquake 146 km SSW of ‘Ohonua, Tonga
A magnitude 4.9 earthquake struck 146 km SSW of ‘Ohonua, Tonga on Sun, Oct 24, 1976, 12:09 PM GMT+13 (23:09 UTC), 172 km (107 mi) below the surface.
A larger quake followed: M5.1 222 km SSW 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
- 4.9 (mb), light
- Local time
- UTC
- 1976-10-23 23:09:41 UTC
- Depth
- 172.0 km (106.9 mi), intermediate-depth
- Epicenter
- 22.616° S, 175.279° 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
- 11
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.1222 km SSW of ‘Ohonua, Tonga · 18184 days ago · 158 km deep · 78 km away
- 5.0143 km SW of Vaini, Tonga · 18180 days ago · 127 km deep · 82 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000k0m. Read Wed, Sep 30, 2026, 4:11 PM UTC.