Tonga earthquakes

M4.6 earthquake 140 km SSW of Vaini, Tonga

A magnitude 4.6 earthquake struck 140 km SSW of Vaini, Tonga on Thu, Jun 23, 1977, 10:34 PM GMT+13 (09:34 UTC), 128 km (80 mi) below the surface.

A larger quake followed: M4.8 200 km SW of ‘Ohonua, Tonga. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.6 (mb), light
Local time
UTC
1977-06-23 09:34:06 UTC
Depth
128.0 km (79.5 mi), intermediate-depth
Epicenter
22.269° S, 175.902° 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
14

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.6 and up: 17 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.5190 km SSW of Vaini, Tonga · 17988 days ago · 138 km deep · 50 km away
  2. 4.8200 km SW of ‘Ohonua, Tonga · 17988 days ago · 98 km deep · 63 km away
  3. 5.5200 km SSW of ‘Ohonua, Tonga · 17987 days ago · 33 km deep · 69 km away
  4. 4.7146 km SSW of ‘Ohonua, Tonga · 17985 days ago · 33 km deep · 29 km away
  5. 5.4160 km SSW of ‘Ohonua, Tonga · 17985 days ago · 51 km deep · 66 km away
  6. 5.0137 km SSW of Vaini, Tonga · 17984 days ago · 33 km deep · 7 km away
  7. 4.9142 km SSW of ‘Ohonua, Tonga · 17982 days ago · 33 km deep · 65 km away
  8. 4.7197 km SSW of ‘Ohonua, Tonga · 17981 days ago · 33 km deep · 68 km away
  9. 4.3199 km SW of Vaini, Tonga · 17973 days ago · 269 km deep · 80 km away
  10. 5.5125 km S of ‘Ohonua, Tonga · 17972 days ago · 33 km deep · 85 km away
  11. 4.9154 km SW of Haveluloto, Tonga · 17965 days ago · 54 km deep · 52 km away
  12. 4.9137 km WSW of Haveluloto, Tonga · 17958 days ago · 294 km deep · 88 km away
  13. 4.5161 km SSW of ‘Ohonua, Tonga · 17950 days ago · 123 km deep · 72 km away
  14. 4.8234 km SW of ‘Ohonua, Tonga · 17947 days ago · 115 km deep · 95 km away
  15. 5.1141 km SW of Vaini, Tonga · 17944 days ago · 122 km deep · 10 km away
  16. 4.5144 km SW of Vaini, Tonga · 17938 days ago · 170 km deep · 25 km away
  17. 4.9160 km SW of ‘Ohonua, Tonga · 17938 days ago · 33 km deep · 25 km away

Before

  1. 6.8Tonga region · 17989 days ago · 65 km deep · 68 km away
  2. 4.7231 km SW of ‘Ohonua, Tonga · 17999 days ago · 123 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000peb. Read Tue, Sep 22, 2026, 9:35 AM UTC.