M4.6 earthquake 235 km S of ‘Ohonua, Tonga
A magnitude 4.6 earthquake struck 235 km S of ‘Ohonua, Tonga on Mon, Apr 1, 1985, 4:45 AM GMT+13 (15:45 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 299 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
- 4.6 (mb), light
- Local time
- UTC
- 1985-03-31 15:45:40 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 23.447° S, 175.167° 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
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 1 in the 30 days before it.
After
- 5.0299 km SSW of ‘Ohonua, Tonga · 15148 days ago · 33 km deep · 75 km away
- 5.1163 km S of ‘Ohonua, Tonga · 15128 days ago · 33 km deep · 81 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002dbe. Read Mon, Sep 21, 2026, 6:56 PM UTC.