M4.6 earthquake 134 km SSE of ‘Ohonua, Tonga
A magnitude 4.6 earthquake struck 134 km SSE of ‘Ohonua, Tonga on Wed, May 31, 1978, 3:10 PM GMT+13 (02:10 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.7 117 km S 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
- 4.6 (mb), light
- Local time
- UTC
- 1978-05-31 02:10:08 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 22.521° S, 174.694° 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.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.1122 km S of ‘Ohonua, Tonga · 17647 days ago · 33 km deep · 13 km away
- 4.7117 km S of ‘Ohonua, Tonga · 17626 days ago · 60 km deep · 23 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000uuq. Read Wed, Sep 30, 2026, 5:59 AM UTC.