Tonga earthquakes

M4.9 earthquake 142 km SSW of ‘Ohonua, Tonga

A magnitude 4.9 earthquake struck 142 km SSW of ‘Ohonua, Tonga on Thu, Jun 30, 1977, 10:25 AM GMT+13 (21:25 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.5 125 km S of ‘Ohonua, 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
4.9 (mb), light
Local time
UTC
1977-06-29 21:25:13 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
22.563° S, 175.354° 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
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.9 and up: 11 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 4.7197 km SSW of ‘Ohonua, Tonga · 17981 days ago · 33 km deep · 66 km away
  2. 5.5125 km S of ‘Ohonua, Tonga · 17972 days ago · 33 km deep · 29 km away
  3. 5.1215 km SSW of ‘Ohonua, Tonga · 17970 days ago · 42 km deep · 74 km away
  4. 5.0214 km S of ‘Ohonua, Tonga · 17968 days ago · 63 km deep · 76 km away
  5. 4.5161 km SSW of ‘Ohonua, Tonga · 17950 days ago · 123 km deep · 19 km away
  6. 5.1141 km SW of Vaini, Tonga · 17944 days ago · 122 km deep · 75 km away
  7. 5.0186 km S of ‘Ohonua, Tonga · 17943 days ago · 33 km deep · 61 km away
  8. 4.9215 km S of ‘Ohonua, Tonga · 17942 days ago · 34 km deep · 90 km away
  9. 4.5144 km SW of Vaini, Tonga · 17938 days ago · 170 km deep · 90 km away
  10. 4.9160 km SW of ‘Ohonua, Tonga · 17938 days ago · 33 km deep · 54 km away
  11. 5.3224 km SSW of ‘Ohonua, Tonga · 17935 days ago · 33 km deep · 85 km away

Before

  1. 4.7236 km S of ‘Ohonua, Tonga · 17982 days ago · 33 km deep · 99 km away
  2. 5.2204 km S of ‘Ohonua, Tonga · 17982 days ago · 38 km deep · 68 km away
  3. 5.0137 km SSW of Vaini, Tonga · 17984 days ago · 33 km deep · 59 km away
  4. 5.4160 km SSW of ‘Ohonua, Tonga · 17985 days ago · 51 km deep · 19 km away
  5. 4.7146 km SSW of ‘Ohonua, Tonga · 17985 days ago · 33 km deep · 38 km away
  6. 4.9212 km S of ‘Ohonua, Tonga · 17987 days ago · 33 km deep · 93 km away
  7. 5.5200 km SSW of ‘Ohonua, Tonga · 17987 days ago · 33 km deep · 71 km away
  8. 4.8200 km SW of ‘Ohonua, Tonga · 17988 days ago · 98 km deep · 78 km away
  9. 4.5190 km SSW of Vaini, Tonga · 17988 days ago · 138 km deep · 78 km away
  10. 4.6140 km SSW of Vaini, Tonga · 17988 days ago · 128 km deep · 65 km away
  11. 6.8Tonga region · 17989 days ago · 65 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000pj1. Read Tue, Sep 22, 2026, 9:20 AM UTC.