M 7.7 earthquake – 30 km NNE of Constitución, Chile
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Local time: Dec 1, 1928 · 00:06 (UTC-4)
MajorShallow · 35 km
Reviewed by a seismologist
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- Magnitude
- 7.7moment magnitude (mw)
- Depth
- 35 kmShallow earthquake
- Epicenter
- -35.084, -72.26731 km from Constitución
- Energy released
- 5.4 megatons of TNTabout 357 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 7.3max. instrumental (MMI)
- Aftershocks
- 8M2.5+ within 190 km, up to 60 days
- Significance
- 912USGS 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?
Major earthquake. It released 5.4 megatons of TNT, 11,220 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
8 earthquakes of M2.5+ within 190 km in the 60 days after.
- 6.0 67 km WNW of Quirihue, Chile Dec 1, 1928
- 6.2 13 km S of Constitución, Chile Dec 1, 1928
- 7.2 47 km NW of Cauquenes, Chile Dec 2, 1928
- 5.5 34 km NW of Constitución, Chile Dec 2, 1928
- 5.3 31 km NE of Constitución, Chile Dec 3, 1928
- 5.5 10 km NNE of Cauquenes, Chile Dec 8, 1928
- 5.6 102 km W of Constitución, Chile Dec 16, 1928
- 5.7 22 km WNW of Talca, Chile Dec 20, 1928
The strongest earthquakes within 300 km
Since 1900, around Chile.
- 8.8 2010 Maule, Chile Earthquake Feb 27, 2010
- 8.0 25 km WSW of Valparaíso, Chile Mar 3, 1985
- 7.8 26 km WNW of San Carlos, Chile Jan 25, 1939
- 7.8 19 km NNE of Hacienda La Calera, Chile Jul 9, 1971
- 7.7 103 km NW of Constitución, Chile Jan 30, 1914
- 7.6 23 km SE of Chiguayante, Chile May 6, 1953
- 7.4 19 km S of Valparaíso, Chile Mar 4, 1985
- 7.2 47 km NW of Cauquenes, Chile Dec 2, 1928