M4.7 earthquake 103 km NNW of Hihifo, Tonga
A magnitude 4.7 earthquake struck 103 km NNW of Hihifo, Tonga on Mon, Aug 13, 1973, 9:51 PM GMT-11 (08:51 UTC), 108 km (67 mi) below the surface.
A larger quake followed: M5.1 101 km N 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
- 1973-08-14 08:51:21 UTC
- Depth
- 108.0 km (67.1 mi), intermediate-depth
- Epicenter
- 15.076° S, 174.114° 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
- Stations used
- 17
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 2 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 usp000032u. Read Tue, Sep 22, 2026, 8:22 AM UTC.