M 6.6 earthquake – 20 km WNW of Zhicheng, China
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Local time: Dec 1, 1921 · 18:49 (UTC+8)
StrongShallow · 15 km
Reviewed by a seismologist
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- Magnitude
- 6.6moment magnitude (mw)
- Depth
- 15 kmShallow earthquake
- Epicenter
- 31.082, 119.71121 km from Zhicheng
- Energy released
- 120 kilotons of TNTabout 8 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- —not estimated
- Aftershocks
- 0M2.5+ within 43 km
- Significance
- 674USGS 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?
Strong earthquake. It released 120 kilotons of TNT, 251 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
The strongest earthquakes within 300 km
Since 1900, around China.
- 6.6 89 km E of Dazhong, China Feb 3, 1927
- 6.4 102 km E of Dazhong, China Feb 3, 1927
- 6.0 51 km NE of Juegang, China May 21, 1984
- 5.5 53 km NE of Juegang, China May 21, 1984
- 5.5 23 km W of Licheng, China Jul 9, 1979
- 5.5 32 km WNW of Hutang, China Apr 22, 1974
- 5.5 50 km ESE of Shanghai, China Dec 30, 1971
- 5.2 53 km E of Dongtai, China Apr 21, 1982