M 7.6 earthquake – 199 km ESE of Hihifo, Tonga
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Local time: Apr 1, 1977 · 20:15 (UTC-11)
MajorShallow · 33 km
Reviewed by a seismologist
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- Magnitude
- 7.6surface-wave magnitude (ms)
- Depth
- 33 kmShallow earthquake
- Epicenter
- -16.696, -172.095308 km from Pago Pago
- Energy released
- 3.8 megatons of TNTabout 253 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 4.0max. instrumental (MMI)
- Aftershocks
- 15M2.5+ within 166 km, up to 60 days
- Significance
- 889USGS score, 0–1,000+
Not rare around here
An earthquake at least as strong struck within 300 km on Dec 26, 1975.
How strong was it?
Major earthquake. It released 3.8 megatons of TNT, 7,943 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
15 earthquakes of M2.5+ within 166 km in the 60 days after.
- 5.1 134 km ESE of Hihifo, Tonga Apr 2, 1977
- 4.8 226 km ESE of Hihifo, Tonga Apr 2, 1977
- 4.9 207 km SE of Hihifo, Tonga Apr 4, 1977
- 5.1 178 km NE of Neiafu, Tonga Apr 7, 1977
- 4.9 173 km NE of Neiafu, Tonga Apr 7, 1977
- 4.9 209 km NE of Neiafu, Tonga Apr 9, 1977
- 4.7 174 km ESE of Hihifo, Tonga Apr 10, 1977
- 4.9 176 km NE of Neiafu, Tonga Apr 13, 1977
- 5.1 194 km SE of Hihifo, Tonga Apr 15, 1977
- 5.1 152 km ESE of Hihifo, Tonga Apr 22, 1977
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
- 7.4 88 km NNE of Hihifo, Tonga Apr 7, 1995
- 7.4 103 km ESE of Neiafu, Tonga Feb 27, 1921