Tonga earthquakes

M5.5 earthquake 125 km S of ‘Ohonua, Tonga

A magnitude 5.5 earthquake struck 125 km S of ‘Ohonua, Tonga on Sun, Jul 10, 1977, 5:44 AM GMT+13 (16:44 UTC), 33 km (21 mi) below the surface.

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

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The earthquake

Magnitude
5.5 (mb), moderate
Local time
UTC
1977-07-09 16:44:09 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
22.455° S, 175.100° 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
86

Nearest places

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

Nearby

Within 100 km, magnitude 2.5 and up: 7 in the 60 days after this one and 10 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000pnk (also filed as gcmtb070977a, gcmt19770709164409, iscgem695732). Read Tue, Sep 22, 2026, 6:17 AM UTC.