M4.5 earthquake 120 km SSE of Hihifo, Tonga
A magnitude 4.5 earthquake struck 120 km SSE of Hihifo, Tonga on Fri, Aug 12, 1977, 1:39 PM GMT-11 (00:39 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.5 (mb), light
- Local time
- UTC
- 1977-08-13 00:39:46 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 16.994° S, 173.456° 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
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 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 usp0000q2j. Read Tue, Sep 22, 2026, 12:17 PM UTC.