M 8.1 earthquake – 1957 Gobi-Altay, Mongolia Earthquake
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Local time: Dec 4, 1957 · 10:37 (UTC+7)
GreatShallow · 30 km
Reviewed by a seismologist
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- Magnitude
- 8.1moment magnitude (mw)
- Depth
- 30 kmShallow earthquake
- Epicenter
- 45.189, 99.368153 km from Bayanhongor
- Energy released
- 21 megatons of TNTabout 1,420 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 7.6max. instrumental (MMI)
- Aftershocks
- 2M2.5+ within 327 km, up to 60 days
- Significance
- 1,009USGS 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?
Great earthquake. It released 21 megatons of TNT, 44,668 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 327 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around Mongolia.
- 6.9 central Mongolia Apr 7, 1958
- 6.3 134 km SW of Hovd, Mongolia Apr 30, 1915
- 6.2 140 km SSW of Bayanhongor, Mongolia Feb 24, 1958
- 6.1 142 km WSW of Bayanhongor, Mongolia Feb 25, 1950
- 6.1 71 km NW of Hovd, Mongolia Dec 4, 1957
- 5.8 138 km SE of Altai, Mongolia Jun 15, 2006
- 5.7 64 km SSE of Altai, Mongolia Jan 7, 1938
- 5.7 24 km SE of Hovd, Mongolia Apr 30, 2006