Tonga earthquakes

M6.6 earthquake 131 km SSW of Hihifo, Tonga

A magnitude 6.6 earthquake struck 131 km SSW of Hihifo, Tonga on Mon, Oct 29, 1984, 1:05 PM GMT-12 (01:05 UTC), 141 km (88 mi) below the surface.

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The earthquake

Magnitude
6.6 (mw), strong
Local time
UTC
1984-10-30 01:05:49 UTC
Depth
141.0 km (87.6 mi), intermediate-depth
Epicenter
17.109° S, 174.076° 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

Nearby

Within 100 km, magnitude 2.5 and up: 3 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.686 km SW of Hihifo, Tonga · 15301 days ago · 192 km deep · 60 km away
  2. 4.6107 km NNE of Neiafu, Tonga · 15294 days ago · 43 km deep · 84 km away
  3. 4.3138 km SSE of Hihifo, Tonga · 15261 days ago · 165 km deep · 82 km away

Before

  1. 4.4116 km S of Hihifo, Tonga · 15309 days ago · 33 km deep · 38 km away
  2. 4.459 km S of Hihifo, Tonga · 15309 days ago · 33 km deep · 76 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00028ms (also filed as gcmtb103084a, gcmt19841030010549, iscgem542383). Read Tue, Sep 22, 2026, 9:11 AM UTC.