Tonga earthquakes

M4.3 earthquake 199 km SW of Vaini, Tonga

A magnitude 4.3 earthquake struck 199 km SW of Vaini, Tonga on Fri, Jul 8, 1977, 10:27 PM GMT+13 (09:27 UTC), 269 km (167 mi) below the surface.

A larger quake followed: M5.1 141 km SW of Vaini, Tonga. This one was a foreshock.

Nuku‘alofa forecastMore in Tonga

Map

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

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The earthquake

Magnitude
4.3 (mb), light
Local time
UTC
1977-07-08 09:27:56 UTC
Depth
269.0 km (167.1 mi), intermediate-depth
Epicenter
22.330° S, 176.673° 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
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 4.9154 km SW of Haveluloto, Tonga · 17972 days ago · 54 km deep · 45 km away
  2. 4.9137 km WSW of Haveluloto, Tonga · 17964 days ago · 294 km deep · 80 km away
  3. 4.8234 km SW of ‘Ohonua, Tonga · 17953 days ago · 115 km deep · 88 km away
  4. 5.1141 km SW of Vaini, Tonga · 17951 days ago · 122 km deep · 72 km away
  5. 4.5144 km SW of Vaini, Tonga · 17945 days ago · 170 km deep · 61 km away
  6. 4.9160 km SW of ‘Ohonua, Tonga · 17944 days ago · 33 km deep · 84 km away

Before

  1. 5.0137 km SSW of Vaini, Tonga · 17991 days ago · 33 km deep · 87 km away
  2. 5.5200 km SSW of ‘Ohonua, Tonga · 17994 days ago · 33 km deep · 97 km away
  3. 4.8200 km SW of ‘Ohonua, Tonga · 17994 days ago · 98 km deep · 83 km away
  4. 4.5190 km SSW of Vaini, Tonga · 17994 days ago · 138 km deep · 70 km away
  5. 4.6140 km SSW of Vaini, Tonga · 17994 days ago · 128 km deep · 80 km away
  6. 6.8Tonga region · 17995 days ago · 65 km deep · 100 km away
  7. 4.7231 km SW of ‘Ohonua, Tonga · 18005 days ago · 123 km deep · 92 km away
  8. 5.2208 km WSW of Haveluloto, Tonga · 18009 days ago · 226 km deep · 39 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000pmz. Read Mon, Sep 28, 2026, 7:15 PM UTC.