M 7.9 earthquake – 70 km S of Honchō, Japan
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Local time: May 16, 1968 · 19:39 (UTC+9)
MajorShallow · 31 km
Reviewed by a seismologist
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- Magnitude
- 7.9moment magnitude (mw)
- Depth
- 31 kmShallow earthquake
- Epicenter
- 41.498, 142.858102 km from Shizunai-furukawachō
- Energy released
- 11 megatons of TNTabout 712 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 6.8max. instrumental (MMI)
- Aftershocks
- 50M2.5+ within 250 km, up to 60 days
- Significance
- 960USGS score, 0–1,000+
Not rare around here
An earthquake at least as strong struck within 300 km on May 16, 1968.
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
50 earthquakes of M2.5+ within 250 km in the 60 days after.
- 5.5 69 km E of Miyako, Japan May 16, 1968
- 6.7 146 km E of Miyako, Japan May 16, 1968
- 5.7 68 km ENE of Hachinohe, Japan May 16, 1968
- 6.1 111 km S of Shizunai-furukawachō, Japan May 16, 1968
- 6.1 79 km SSW of Honchō, Japan May 16, 1968
- 6.5 111 km E of Miyako, Japan May 16, 1968
- 6.2 134 km E of Miyako, Japan May 17, 1968
- 5.7 68 km S of Honchō, Japan May 17, 1968
- 5.6 155 km E of Miyako, Japan May 17, 1968
- 6.4 191 km SSE of Hiroo, Japan May 17, 1968
The strongest earthquakes within 300 km
Since 1900, around Japan.
- 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 78 km E of Hachinohe, Japan Mar 9, 1931
- 7.8 off the east coast of Honshu, Japan Dec 28, 1994
- 7.7 277 km SSE of Kushiro, Japan May 3, 1919
In the week before
Earthquakes within 250 km in the 7 days before this one: possible foreshocks.