M 6.9 earthquake – central Mongolia
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Local time: Apr 8, 1958 · 02:13 (UTC+7)
StrongShallow · 30 km
Reviewed by a seismologist
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- Magnitude
- 6.9moment magnitude (mw)
- Depth
- 30 kmShallow earthquake
- Epicenter
- 45.273, 98.577195 km from Bayanhongor
- Energy released
- 338 kilotons of TNTabout 23 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 7.0max. instrumental (MMI)
- Aftershocks
- 1M2.5+ within 64 km, up to 60 days
- Significance
- 726USGS score, 0–1,000+
Not rare around here
An earthquake at least as strong struck within 300 km on Dec 4, 1957.
How strong was it?
Strong earthquake. It released 338 kilotons of TNT, 708 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
1 earthquakes of M2.5+ within 64 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around Mongolia.
- 8.1 1957 Gobi-Altay, Mongolia Earthquake Dec 4, 1957
- 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
- 5.7 193 km SW of Bayanhongor, Mongolia Apr 13, 1958