M4.6 earthquake 210 km SSW of ‘Ohonua, Tonga
A magnitude 4.6 earthquake struck 210 km SSW of ‘Ohonua, Tonga on Wed, Mar 11, 1981, 10:46 PM GMT+13 (09:46 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.5 234 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
- 1981-03-11 09:46:33 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 23.196° S, 175.381° 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: 3 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.5224 km S of ‘Ohonua, Tonga · 16631 days ago · 33 km deep · 28 km away
- 5.5234 km S of ‘Ohonua, Tonga · 16605 days ago · 35 km deep · 24 km away
- 5.2236 km S of ‘Ohonua, Tonga · 16603 days ago · 40 km deep · 36 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001cna. Read Sun, Sep 27, 2026, 2:46 AM UTC.