M5.6 earthquake 73 km ENE of ‘Ohonua, Tonga
A magnitude 5.6 earthquake struck 73 km ENE of ‘Ohonua, Tonga on Thu, Apr 28, 1983, 6:20 AM GMT+13 (17:20 UTC), 21 km (13 mi) below the surface.
A larger quake followed: M5.8 72 km E 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
- 5.6 (ms), moderate
- Local time
- UTC
- 1983-04-27 17:20:35 UTC
- Depth
- 21.0 km (13.0 mi), shallow
- Epicenter
- 21.137° S, 174.272° 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
- CONSTRAINED_BY_DEPTH_PHASES
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.6 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.872 km E of ‘Ohonua, Tonga · 15860 days ago · 23 km deep · 24 km away
- 5.378 km E of ‘Ohonua, Tonga · 15853 days ago · 33 km deep · 18 km away
- 5.7155 km E of ‘Ohonua, Tonga · 15848 days ago · 33 km deep · 91 km away
- 5.1Tonga · 15842 days ago · 33 km deep · 51 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001uu7 (also filed as gcmtb042783b, gcmt19830427172035, iscgem579708). Read Wed, Sep 30, 2026, 4:26 PM UTC.