M4.6 earthquake 70 km SE of Pangai, Tonga
A magnitude 4.6 earthquake struck 70 km SE of Pangai, Tonga on Tue, Mar 18, 1975, 2:53 PM GMT+13 (01:53 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 113 km ENE of ‘Ohonua, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1975-03-18 01:53:19 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 20.337° S, 173.961° 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
- 11
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.9113 km ENE of ‘Ohonua, Tonga · 18787 days ago · 33 km deep · 62 km away
- 5.1120 km SSE of Pangai, Tonga · 18780 days ago · 40 km deep · 53 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000a9p. Read Tue, Sep 22, 2026, 6:58 AM UTC.