M4.6 earthquake 77 km SE of Pangai, Tonga
A magnitude 4.6 earthquake struck 77 km SE of Pangai, Tonga on Sat, Jun 21, 1975, 8:33 PM GMT+13 (07:33 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.4 90 km SSE of Pangai, 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
- 1975-06-21 07:33:28 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 20.291° S, 173.813° 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
- 14
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 3 in the 60 days after this one and 5 in the 30 days before it.
After
- 5.490 km SSE of Pangai, Tonga · 18718 days ago · 23 km deep · 51 km away
- 5.093 km E of Pangai, Tonga · 18704 days ago · 12 km deep · 51 km away
- 4.9117 km E of ‘Ohonua, Tonga · 18698 days ago · 33 km deep · 95 km away
Before
- 5.1101 km SSE of Pangai, Tonga · 18729 days ago · 33 km deep · 45 km away
- 5.064 km S of Pangai, Tonga · 18729 days ago · 39 km deep · 57 km away
- 5.1118 km SSE of Pangai, Tonga · 18750 days ago · 33 km deep · 54 km away
- 5.5131 km ENE of ‘Ohonua, Tonga · 18750 days ago · 19 km deep · 68 km away
- 4.7121 km SSE of Pangai, Tonga · 18751 days ago · 33 km deep · 57 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000bph. Read Tue, Sep 22, 2026, 7:45 PM UTC.