M 7.9 earthquake – 78 km E of Hachinohe, Japan
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Local time: Mar 9, 1931 · 12:49 (UTC+9)
MajorShallow · 35 km
Reviewed by a seismologist
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- Magnitude
- 7.9moment magnitude (mw)
- Depth
- 35 kmShallow earthquake
- Epicenter
- 40.591, 142.42271 km from Kuji
- Energy released
- 11 megatons of TNTabout 712 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 6.7max. instrumental (MMI)
- Aftershocks
- 3M2.5+ within 250 km, up to 60 days
- Significance
- 965USGS 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
3 earthquakes of M2.5+ within 250 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around Japan.
- 9.1 2011 Great Tohoku Earthquake, Japan Mar 11, 2011
- 8.4 1933 Sanriku (Sanriku-oki) Earthquake, Japan Mar 2, 1933
- 8.2 1968 Tokachi-Oki Earthquake May 16, 1968
- 8.2 2003 Tokachi-Oki Earthquake Sep 25, 2003
- 8.1 1952 Tokachi-Oki Earthquake Mar 4, 1952
- 7.9 113 km ENE of Miyako, Japan Mar 20, 1960
- 7.9 70 km S of Honchō, Japan May 16, 1968
- 7.8 off the east coast of Honshu, Japan Dec 28, 1994