1960 Concepción earthquakes explained

The first 1960 Concepción earthquake
Timestamp:1960-05-21 10:02
Anss-Url:iscgem879106
Isc-Event:879106
Local-Time:6:02 AM UTC-4
Magnitude:8.1
8.3 Ms[1]
Depth:25km (16miles)[2]
Casualties:125 dead
Countries Affected:Chile

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.[3]

The first was on May 21 at 06:02 UTC-4.[4] [5] Its epicenter was near Cañete, Bío Bío Region, Chile, and its magnitude was 8.1  or 8.3MW and 7.3 or 7.5MS. This earthquake, which lasted 35 seconds, destroyed a third of the buildings in the city of Concepción.[6]

The earthquake effectively interrupted and ended Lota's coal miners march on Concepción where they demanded higher salaries.[7]

+ First earthquake intensity[8]
21 May at 6:02 UTC earthquake
City Damage
IX 125 dead. A third of the buildings were destroyed.
IX 65% of buildings were destroyed.
IX
IX
X
The second 1960 Concepción earthquake
Timestamp:1960-05-22 10:30:44
Anss-Url:iscgem879127
Isc-Event:879127
Local-Time:06:30 AM UTC-4
Magnitude:7.1 [9]
Depth:25.0 km
Location:Nahuelbuta National Park
Countries Affected:Concepción, Arauco and Ñuble in Chile

The second happened on May 22 at 06:30 UTC-4.[10] Its epicenter was in the Nahuelbuta National Park, Araucanía Region, Chile, and its magnitude was 7.1 Mw. It was followed by a 6.8 Mw earthquake at 06:32 UTC-4.[11]

The third 1960 Concepción earthquake
Timestamp:1960-05-22 18:56:02
Anss-Url:official19600522185602_30
Isc-Event:879134
Local-Time:14:56 PM UTC-4
Magnitude:7.8[12] Mw 7.8 MS
Depth:25 km
Location:Purén
-38.061°N -73.039°W
Countries Affected: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. This earthquake happened 15 minutes before the 1960 Valdivia earthquake.[13]

See also

Notes and References

  1. The 2010 Mw 8.8 Maule Megathrust Earthquake of Central Chile, Monitored by GPS. Vigny, C.. Socquet, A.. Peyrat, S.. Ruegg, J.C.. Métois, M.. Madariaga, R.. Morvan, S.. Lancieri, M.. Lacassin, R.. Campos, J.. amp. Science. 332. 6036. 1417–21. 2011. 10.1126/science.1204132. etal. 21527673. 2011Sci...332.1417V. free.
  2. Web site: M8.1 - Bio-Bio, Chile 1960-05-21 10:02:54 UTC. U.S. Geological Survey. USGS. 1 June 2015.
  3. The 1960 Chile earthquake: inversion for slip distribution from surface deformation . Barrientos S.E. . Ward S.N. . Geophysical Journal International . 1990 . 103 . 3 . 589–598 . 10.1111/j.1365-246X.1990.tb05673.x. 1990GeoJI.103..589B . free .
  4. Servicio Sismológico Universidad de Chile, Sismos importantes o destructivos desde 1570
  5. The 21 May 1960 M w 8.1 Concepción earthquake: A deep megathrust foreshock that started the 1960 central-south Chilean seismic sequence . Ojeda J. . Ruiz S. . del Campo F. . Carvajal M. . Seismological Research Letters . 2020 . 91 . 3 . 1617–1627 . 10.1785/0220190143. free .
  6. Rudolph . William E. . Catastrophe in Chile . 1960 . Geographical Review. 50. 4. 578–581 . 212311. 10.2307/212311 . 1960GeoRv..50..578R .
  7. Reyes Herrera . Sonia E. . Rodríguez Torrent. Juan Carlos. Medina Hernández . Patricio . 2014 . El sufrimiento colectivo de una ciudad minera en declinación. El caso de Lota, Chile . Horizontes Antropológicos . 20 . 42 . es .
  8. Jean Pierre Rothe: The seismicity of the earth, 1953–1965. UNESCO, Paris 1969. (Abstract in the United States Geological Survey web site)
  9. Web site: M 7.1 - Bio-Bio, Chile. U.S. Geological Survey. USGS. 19 November 2016.
  10. Web site: M 7.1 - Bio-Bio, Chile. U.S. Geological Survey. USGS. 19 November 2016.
  11. Web site: M 6.8 - Bio-Bio, Chile. U.S. Geological Survey. USGS. 19 November 2016.
  12. Web site: M 7.8 - Araucania, Chile. U.S. Geological Survey. USGS. 19 November 2016.
  13. Web site: Generalities . June 10, 2011 . SHOA . 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 . https://web.archive.org/web/20110709032126/http://www.shoa.cl/index_ing.html . 2011-07-09 . dead .

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