M 7.6 earthquake – 7 km N of Pantla, Mexico
·
Local time: Sep 20, 1985 · 19:37 (UTC-6)
MajorShallow · 31 km
Reviewed by a seismologist
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- Magnitude
- 7.6moment magnitude (mw)
- Depth
- 31 kmShallow earthquake
- Epicenter
- 17.802, -101.64720 km from Ixtapa-Zihuatanejo
- Energy released
- 3.8 megatons of TNTabout 253 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 7.1max. instrumental (MMI)
- Aftershocks
- 8M2.5+ within 166 km, up to 60 days
- Significance
- 889USGS score, 0–1,000+
Not rare around here
An earthquake at least as strong struck within 300 km on Sep 19, 1985.
How strong was it?
Major earthquake. It released 3.8 megatons of TNT, 7,943 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 166 km in the 60 days after.
- 4.5 35 km SSW of Palos Blancos, Mexico Sep 23, 1985
- 4.5 12 km WNW of La Unión, Mexico Sep 24, 1985
- 4.5 15 km S of Playa Azul, Mexico Sep 24, 1985
- 5.7 44 km WNW of El Habillal, Mexico Sep 25, 1985
- 4.7 12 km E of Petacalco, Mexico Sep 27, 1985
- 5.4 15 km WSW of Papanoa, Mexico Sep 28, 1985
- 4.8 55 km SSW of Aguililla, Mexico Oct 15, 1985
- 5.9 24 km NW of El Habillal, Mexico Oct 29, 1985
The strongest earthquakes within 300 km
Since 1900, around Mexico.
- 8.0 1985 Michoacan, Mexico Earthquake Sep 19, 1985
- 7.8 7 km E of Los Tepames, Mexico Jun 18, 1932
- 7.6 35 km SSW of Aguililla, Mexico Sep 19, 2022
- 7.6 16 km SSW of Cuyutlán, Mexico Jan 22, 2003
- 7.6 12 km SSE of Vallecitos de Zaragoza, Mexico Mar 14, 1979
- 7.6 8 km ENE of Apantla, Mexico Jul 28, 1957
- 7.6 21 km ESE of Coalcomán de Vázquez Pallares, Mexico Apr 15, 1941
- 7.6 19 km W of Arteaga, Mexico Jun 7, 1911
In the week before
Earthquakes within 166 km in the 7 days before this one: possible foreshocks.
- 8.0 1985 Michoacan, Mexico Earthquake Sep 19, 1985
- 4.8 6 km SW of El Habillal, Mexico Sep 19, 1985
- 5.0 16 km ENE of Pantla, Mexico Sep 19, 1985
- 4.7 8 km S of Ixtapa-Zihuatanejo, Mexico Sep 20, 1985
- 4.5 13 km S of Ixtapa-Zihuatanejo, Mexico Sep 20, 1985
- 4.9 33 km W of El Habillal, Mexico Sep 20, 1985