1960 Concepción earthquakes

The first 1960 earthquake of Concepción
Date 21 May 1960 06:02 UTC-4 (1960-05-21)[1]
Magnitude 8.1 [2] 8.3[3]Mw 7.3 [1] 7.5[4]MS
Depth 25.0 km [2]
Epicenter Cañete
37°49′26.4″S 73°21′10.8″W / 37.824000°S 73.353000°W / -37.824000; -73.353000Coordinates: 37°49′26.4″S 73°21′10.8″W / 37.824000°S 73.353000°W / -37.824000; -73.353000[2]
Areas affected Concepción, Arauco and Ñuble in Chile
Max. intensity X[5] Mercalli
Casualties 125 dead

The 1960 Concepción earthquakes were a succession of three destructive earthquakes that happened between 21 and 22 May 1960. They formed part of the foreshock sequence for the 1960 Valdivia earthquake, the largest recorded earthquake in history.[6]

The first was on May 21 at 06:02 UTC-4. Its epicenter was near Cañete, Bío Bío Region, Chile, and its magnitude was 8.1 [2] or 8.3[3]MW and 7.3[1] or 7.5[4]MS. This earthquake, which lasted 35 seconds, destroyed a third of the buildings in the city of Concepción.[7]

 First earthquake intensity[5]
21 May at 6:02 UTC earthquake
City MMI Damage
Concepción IX 125 dead. A third of the buildings were destroyed.[7]
Talcahuano IX 65% of buildings were destroyed.
Coronel IX
Lota IX
Lebu X
The second 1960 earthquake of Concepción
Date 22 May 1960 06:30 UTC-4 (1960-05-22)[8]
Magnitude 7.1[8] Mw
Depth 25.0[8] km
Epicenter Nahuelbuta National Park
37°46′30″S 73°01′02″W / 37.77500°S 73.01722°W / -37.77500; -73.01722[8]
Areas affected Provinces of Concepción, Arauco and Ñuble in Chile

The second happened on May 22 at 06:30 UTC-4. Its epicenter was in the Nahuelbuta National Park, Araucanía Region, Chile, and its magnitude was 7.1 Mw.[8] It was followed by a 6.8 Mw earthquake at 06:32 UTC-4.[9]

The third 1960 earthquake of Concepción
Date 22 May 1960 14:56 UTC-4 (1960-05-22)[10]
Magnitude 7.8[10] Mw 7.8[4] MS
Depth 25 km [10]
Epicenter Purén
38°03′39.6″S 73°02′20.4″W / 38.061000°S 73.039000°W / -38.061000; -73.039000[10]
Areas affected Provinces of Concepción, Arauco and Ñuble in Chile

The third happened the same day at 14:56 UTC-4. Its epicenter was near Purén, Araucanía Region, Chile and its magnitude was 7.8 MS or 7.8 Mw.[10] This earthquake happened 15 minutes before the 1960 Valdivia earthquake.[4]

See also

References

  1. 1 2 3 Servicio Sismológico Universidad de Chile, Sismos importantes o destructivos desde 1570
  2. 1 2 3 4 "M8.1 - Bio-Bio, Chile 1960-05-21 10:02:54 UTC". U.S. Geological Survey. USGS. Retrieved 1 June 2015.
  3. 1 2 Vigny, C.; Socquet, A.; Peyrat, S.; Ruegg, J.C.; Métois, M.; Madariaga, R.; Morvan, S.; Lancieri, M.; Lacassin, R.; Campos, J.; et al. (2011). "The 2010 Mw 8.8 Maule Megathrust Earthquake of Central Chile, Monitored by GPS". Science. 332 (6036): 1417. doi:10.1126/science.1204132.
  4. 1 2 3 4 SHOA. "Generalities". Retrieved June 10, 2011. The sequence started with an earthquake magnitude Ms=7.5 at 10:02 GMT on May 21st, followed by another on May 22nd, magnitude Ms=7.8 at 18:55 GMT
  5. 1 2 Jean Pierre Rothe: The seismicity of the earth, 1953–1965. UNESCO, Paris 1969. (Abstract in the United States Geological Survey web site)
  6. ↑ Barrientos S.E.; Ward S.N. (1990). "The 1960 Chile earthquake: inversion for slip distribution from surface deformation" (PDF). Geophysical Journal International. 103 (3): 589–598. doi:10.1111/j.1365-246X.1990.tb05673.x.
  7. 1 2 Rudolph, William E. (1960). "Catastrophe in Chile". Geographical Review. 50 (4): 578–581. JSTOR 212311.
  8. 1 2 3 4 5 "M 7.1 - Bio-Bio, Chile". U.S. Geological Survey. USGS. Retrieved 19 November 2016.
  9. ↑ "M 6.8 - Bio-Bio, Chile". U.S. Geological Survey. USGS. Retrieved 19 November 2016.
  10. 1 2 3 4 5 "M 7.8 - Araucania, Chile". U.S. Geological Survey. USGS. Retrieved 19 November 2016.
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