M 6.6 earthquake – 131 km SSW of Hihifo, Tonga
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Local time: Oct 29, 1984 · 14:05 (UTC-11)
StrongIntermediate · 141 km
Reviewed by a seismologist
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- Magnitude
- 6.6moment magnitude (mw)
- Depth
- 141 kmIntermediate earthquake
- Epicenter
- -17.109, -174.076441 km from Apia
- Energy released
- 120 kilotons of TNTabout 8 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- —not estimated
- Aftershocks
- 0M2.5+ within 43 km
- Significance
- 670USGS score, 0–1,000+
Not rare around here
An earthquake at least as strong struck within 300 km on Oct 15, 1984.
How strong was it?
Strong earthquake. It released 120 kilotons of TNT, 251 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
The strongest earthquakes within 300 km
Since 1900, around Tonga.
- 8.1 2009 Samoa Earthquake Sep 29, 2009
- 8.1 1919 Tonga Earthquake Apr 30, 1919
- 8.0 The 1917 Samoa-Tonga Earthquake Jun 26, 1917
- 7.8 146 km ESE of Hihifo, Tonga Dec 26, 1975
- 7.7 133 km NE of Hihifo, Tonga Sep 1, 1981
- 7.6 82 km WNW of Hihifo, Tonga May 10, 2023
- 7.6 199 km ESE of Hihifo, Tonga Apr 2, 1977
- 7.5 158 km W of Neiafu, Tonga Mar 24, 2026