M 7.9 earthquake – 58 km ESE of Takanabe, Japan
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Local time: Nov 2, 1931 · 19:03 (UTC+9)
MajorShallow · 35 km
Reviewed by a seismologist
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- Magnitude
- 7.9moment magnitude (mw)
- Depth
- 35 kmShallow earthquake
- Epicenter
- 31.884, 132.04356 km from Shintomi
- Energy released
- 11 megatons of TNTabout 712 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 6.5max. instrumental (MMI)
- Aftershocks
- 2M2.5+ within 250 km, up to 60 days
- Significance
- 967USGS score, 0–1,000+
The strongest within 300 km on record
No earthquake this strong has been recorded this close since our catalog begins in 1900.
How strong was it?
Major earthquake. It released 11 megatons of TNT, 22,387 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
2 earthquakes of M2.5+ within 250 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around Japan.
- 8.0 1941 Hyuganada Earthquake Nov 18, 1941
- 7.5 18 km NNE of Nichinan, Japan Feb 26, 1961
- 7.5 60 km ESE of Nobeoka, Japan Apr 1, 1968
- 7.5 18 km SE of Honmachi, Japan Nov 10, 1909
- 7.4 152 km ESE of Koshima, Japan Feb 1, 1916
- 7.4 22 km N of Nishinoomote, Japan Jul 13, 1923
- 7.2 29 km ESE of Takanabe, Japan Apr 13, 1913
- 7.1 2024 Hyuganada Sea, Japan Earthquake Aug 8, 2024
In the week before
Earthquakes within 250 km in the 7 days before this one: possible foreshocks.