M4.8 earthquake Tonga
A magnitude 4.8 earthquake struck in Tonga on Sun, Feb 20, 1977, 12:57 AM GMT-12 (12:57 UTC), 219 km (136 mi) below the surface.
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
- 1977-02-20 12:57:06 UTC
- Depth
- 219.0 km (136.1 mi), intermediate-depth
- Epicenter
- 16.754° S, 174.790° 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.
- Stations used
- 9
Nearby
Within 100 km, magnitude 1.8 and up: 0 in the 60 days after this one and 1 in the 30 days before it.
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000mne. Read Tue, Sep 22, 2026, 10:41 AM UTC.