Tonga earthquakes

M4.7 earthquake 236 km S of ‘Ohonua, Tonga

A magnitude 4.7 earthquake struck 236 km S of ‘Ohonua, Tonga on Thu, Jun 30, 1977, 8:30 AM GMT+13 (19:30 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.9 142 km SSW 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
4.7 (mb), light
Local time
UTC
1977-06-29 19:30:36 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
23.450° S, 175.270° 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 1.7 and up: 10 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 4.9142 km SSW of ‘Ohonua, Tonga · 17982 days ago · 33 km deep · 99 km away
  2. 4.7197 km SSW of ‘Ohonua, Tonga · 17981 days ago · 33 km deep · 89 km away
  3. 4.8278 km SSW of ‘Ohonua, Tonga · 17981 days ago · 33 km deep · 50 km away
  4. 5.1215 km SSW of ‘Ohonua, Tonga · 17970 days ago · 42 km deep · 46 km away
  5. 5.0214 km S of ‘Ohonua, Tonga · 17968 days ago · 63 km deep · 23 km away
  6. 4.4269 km S of ‘Ohonua, Tonga · 17968 days ago · 33 km deep · 33 km away
  7. 4.5161 km SSW of ‘Ohonua, Tonga · 17950 days ago · 123 km deep · 82 km away
  8. 5.0186 km S of ‘Ohonua, Tonga · 17943 days ago · 33 km deep · 55 km away
  9. 4.9215 km S of ‘Ohonua, Tonga · 17942 days ago · 34 km deep · 38 km away
  10. 5.3224 km SSW of ‘Ohonua, Tonga · 17935 days ago · 33 km deep · 18 km away

Before

  1. 5.2204 km S of ‘Ohonua, Tonga · 17982 days ago · 38 km deep · 33 km away
  2. 4.8244 km S of ‘Ohonua, Tonga · 17983 days ago · 33 km deep · 11 km away
  3. 4.7243 km S of ‘Ohonua, Tonga · 17983 days ago · 47 km deep · 7 km away
  4. 5.4160 km SSW of ‘Ohonua, Tonga · 17985 days ago · 51 km deep · 86 km away
  5. 4.9212 km S of ‘Ohonua, Tonga · 17987 days ago · 33 km deep · 50 km away
  6. 5.5200 km SSW of ‘Ohonua, Tonga · 17987 days ago · 33 km deep · 93 km away
  7. 6.8Tonga region · 17989 days ago · 65 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000phy. Read Tue, Sep 22, 2026, 11:34 AM UTC.