M4.8 earthquake 148 km SW of Vaini, Tonga
A magnitude 4.8 earthquake struck 148 km SW of Vaini, Tonga on Tue, Aug 21, 1984, 7:02 PM GMT+13 (06:02 UTC), 141 km (88 mi) below the surface.
A larger quake followed: M4.9 62 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
- 4.8 (mb), light
- Local time
- UTC
- 1984-08-21 06:02:19 UTC
- Depth
- 141.2 km (87.7 mi), intermediate-depth
- Epicenter
- 22.288° S, 176.005° 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
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 1 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 usp00026k0. Read Tue, Sep 22, 2026, 6:34 AM UTC.