Tonga earthquakes

M5.5 earthquake 119 km NE of Neiafu, Tonga

A magnitude 5.5 earthquake struck 119 km NE of Neiafu, Tonga on Sat, Aug 11, 1984, 9:30 PM GMT-12 (09:30 UTC), 33 km (21 mi) below the surface.

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The earthquake

Magnitude
5.5 (mw), moderate
Local time
UTC
1984-08-12 09:30:37 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
17.841° S, 173.233° 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

Nearby

Within 100 km, magnitude 2.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.451 km N of Neiafu, Tonga · 15365 days ago · 33 km deep · 88 km away
  2. 4.5152 km SSE of Hihifo, Tonga · 15363 days ago · 33 km deep · 70 km away

Before

  1. 4.749 km N of Neiafu, Tonga · 15403 days ago · 33 km deep · 86 km away
  2. 4.4147 km S of Hihifo, Tonga · 15407 days ago · 50 km deep · 86 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00026c9 (also filed as gcmtb081284c, gcmt19840812093036, iscgem546664). Read Tue, Sep 22, 2026, 8:52 PM UTC.