M4.7 earthquake 90 km ENE of Kolonga, Tonga
A magnitude 4.7 earthquake struck 90 km ENE of Kolonga, Tonga on Wed, Jul 17, 1974, 4:51 PM GMT+13 (03:51 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 96 km ENE of Kolonga, 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
- 1974-07-17 03:51:16 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 20.782° S, 174.280° 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
- 18
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.899 km SSE of Pangai, Tonga · 19068 days ago · 33 km deep · 30 km away
- 5.096 km ENE of Kolonga, Tonga · 19062 days ago · 33 km deep · 8 km away
- 4.581 km S of Pangai, Tonga · 19058 days ago · 33 km deep · 27 km away
- 4.849 km ESE of ‘Ohonua, Tonga · 19030 days ago · 33 km deep · 86 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000076h. Read Wed, Sep 30, 2026, 7:28 AM UTC.