M 7.9 earthquake – 56 km WSW of Panguna, Papua New Guinea
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Local time: Jul 21, 1975 · 00:37 (UTC+10)
MajorShallow · 49 km
Reviewed by a seismologist
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- Magnitude
- 7.9surface-wave magnitude (ms)
- Depth
- 49 kmShallow earthquake
- Epicenter
- -6.590, 155.05469 km from Arawa
- Energy released
- 11 megatons of TNTabout 712 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 6.8max. instrumental (MMI)
- Aftershocks
- 105M2.5+ within 250 km, up to 60 days
- Significance
- 960USGS score, 0–1,000+
The strongest here since 1971
The last earthquake at least as strong within 300 km struck on Jul 26, 1971.
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
105 earthquakes of M2.5+ within 250 km in the 60 days after.
- 5.1 78 km S of Panguna, Papua New Guinea Jul 20, 1975
- 5.5 145 km SW of Panguna, Papua New Guinea Jul 20, 1975
- 4.5 112 km WSW of Panguna, Papua New Guinea Jul 20, 1975
- 4.7 96 km SW of Panguna, Papua New Guinea Jul 20, 1975
- 5.4 90 km SW of Panguna, Papua New Guinea Jul 20, 1975
- 4.5 126 km WSW of Panguna, Papua New Guinea Jul 20, 1975
- 4.6 100 km W of Panguna, Papua New Guinea Jul 20, 1975
- 5.4 136 km WSW of Panguna, Papua New Guinea Jul 20, 1975
- 5.4 99 km SW of Panguna, Papua New Guinea Jul 20, 1975
- 4.9 109 km WSW of Panguna, Papua New Guinea Jul 20, 1975
The strongest earthquakes within 300 km
Since 1900, around Papua New Guinea.
- 8.1 1919 Papua New Guinea Earthquake May 6, 1919
- 8.1 1971 Bougainville Earthquake Jul 26, 1971
- 8.0 1971 New Britain Earthquake Jul 14, 1971
- 7.9 35 km WNW of Panguna, Papua New Guinea Jan 22, 2017
- 7.9 140 km E of Kokopo, Papua New Guinea Dec 17, 2016
- 7.8 85 km S of Panguna, Papua New Guinea Jan 30, 1939
- 7.8 135 km SE of Kokopo, Papua New Guinea Nov 16, 2000
- 7.7 155 km WNW of Panguna, Papua New Guinea Aug 16, 1995