M4.9 earthquake 70 km NNE of Kolonga, Tonga
A magnitude 4.9 earthquake struck 70 km NNE of Kolonga, Tonga on Tue, Sep 25, 1973, 3:06 PM GMT+13 (02:06 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
- 4.9 (mb), light
- Local time
- UTC
- 1973-09-25 02:06:38 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 20.520° S, 174.883° 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
- 15
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.981 km WSW of Pangai, Tonga · 19327 days ago · 90 km deep · 43 km away
- 4.986 km S of Pangai, Tonga · 19303 days ago · 33 km deep · 64 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00003j5. Read Tue, Sep 22, 2026, 9:09 AM UTC.