M4.5 earthquake 136 km SSW of Hihifo, Tonga
A magnitude 4.5 earthquake struck 136 km SSW of Hihifo, Tonga on Thu, Sep 27, 1973, 6:56 PM GMT-12 (06:56 UTC), 92 km (57 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
- 1973-09-28 06:56:59 UTC
- Depth
- 92.0 km (57.2 mi), intermediate-depth
- Epicenter
- 17.032° S, 174.416° 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
- 11
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 1 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 usp00003ke. Read Tue, Sep 22, 2026, 10:30 AM UTC.