M4.7 earthquake 104 km WNW of Hihifo, Tonga
A magnitude 4.7 earthquake struck 104 km WNW of Hihifo, Tonga on Mon, Jun 20, 1977, 9:58 PM GMT-11 (08:58 UTC), 306 km (190 mi) below the surface.
A larger quake followed: M5.2 181 km W of Hihifo, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (mb), light
- Local time
- UTC
- 1977-06-21 08:58:21 UTC
- Depth
- 306.0 km (190.1 mi), deep
- Epicenter
- 15.763° S, 174.755° 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
- 51
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 1 in the 60 days after this one and 2 in the 30 days before it.
After
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000pdc. Read Tue, Sep 22, 2026, 8:25 PM UTC.