Tonga earthquakes

M5.4 earthquake 160 km SSW of ‘Ohonua, Tonga

A magnitude 5.4 earthquake struck 160 km SSW of ‘Ohonua, Tonga on Sun, Jun 26, 1977, 6:59 PM GMT+13 (05:59 UTC), 51 km (32 mi) below the surface.

A larger quake followed: M5.5 125 km S of ‘Ohonua, Tonga. This one was a foreshock.

Nuku‘alofa forecast More in Tonga

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The earthquake

Magnitude: 5.4 (mb), moderate
Local time: Sun, Jun 26, 1977, 6:59 PM GMT+13
UTC: 1977-06-26 05:59:21 UTC
Depth: 51.0 km (31.7 mi), shallow
Epicenter: 22.702° S, 175.466° 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: 110

Nearest places

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

Nuku‘alofa, TongaPopulation 22,400. Forecast176 kmS

Nearby

Within 100 km, magnitude 2.4 and up: 18 in the 60 days after this one and 8 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000pg1 (also filed as gcmtb062677a, gcmt19770626055921, iscgem697736). Read Mon, Sep 28, 2026, 10:34 AM UTC.