M 6.6 earthquake – western Indian-Antarctic Ridge
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Local time: May 12, 1976 · 01:50 (UTC+10)
StrongShallow · 33 km
Reviewed by a seismologist
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- Magnitude
- 6.6surface-wave magnitude (ms)
- Depth
- 33 kmShallow earthquake
- Epicenter
- -51.603, 139.6831,129 km from Hobart
- 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
- 670USGS 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.
- 6.6 western Indian-Antarctic Ridge Jun 11, 2000
- 6.4 western Indian-Antarctic Ridge Apr 23, 1946
- 6.4 western Indian-Antarctic Ridge Jun 14, 1927
- 6.4 western Indian-Antarctic Ridge Jun 9, 2004
- 6.4 western Indian-Antarctic Ridge Aug 24, 1936
- 6.3 western Indian-Antarctic Ridge Jan 7, 1921
- 6.3 west of Macquarie Island Oct 11, 2023
- 6.3 western Indian-Antarctic Ridge Apr 18, 2019
In the week before
Earthquakes within 43 km in the 7 days before this one: possible foreshocks.