Tonga earthquakes

M5.5 earthquake 144 km SSW of Hihifo, Tonga

A magnitude 5.5 earthquake struck 144 km SSW of Hihifo, Tonga on Sat, Jun 24, 1978, 10:21 PM GMT-12 (10:21 UTC), 159 km (99 mi) below the surface.

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The earthquake

Magnitude
5.5 (mb), moderate
Local time
UTC
1978-06-25 10:21:45 UTC
Depth
159.0 km (98.8 mi), intermediate-depth
Epicenter
17.111° S, 174.431° 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
CONSTRAINED_BY_DEPTH_PHASES
Stations used
206

Nearby

Within 100 km, magnitude 2.5 and up: 1 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.998 km NNW of Neiafu, Tonga · 17614 days ago · 121 km deep · 81 km away

Before

  1. 4.9117 km NNW of Neiafu, Tonga · 17637 days ago · 105 km deep · 60 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000v9t (also filed as gcmtb062578a, gcmt19780625102145, iscgem681439). Read Wed, Sep 30, 2026, 5:52 PM UTC.