M5.0 earthquake 113 km ENE of ‘Ohonua, Tonga
A magnitude 5.0 earthquake struck 113 km ENE of ‘Ohonua, Tonga on Sun, Apr 17, 1977, 3:34 PM GMT+13 (02:34 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.2 62 km ENE 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
- 5.0 (mb), moderate
- Local time
- UTC
- 1977-04-17 02:34:43 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 21.008° S, 173.918° 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
- 19
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.0 and up: 2 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000nej. Read Tue, Sep 22, 2026, 8:30 AM UTC.