1971 Aconcagua earthquake

The Valparaíso Region of central Chile was struck by an earthquake of magnitude 7.8 Mw at 22:03 8 July 1971 local time (03:03 9 July UTC). It had a maximum felt intensity of IX (violent) on the Modified Mercalli intensity scale and caused the deaths of 83 people and injured a further 447.[1]

1971 Aconcagua earthquake
UTC time1971-07-09 03:03:19
ISC event782010
USGS-ANSSComCat
Local dateJuly 8, 1971 (1971-07-08)
Local time22:03 CST[1]
Magnitude7.8 Mw[1]
Depth58 km (36 mi)
Epicenter32.54°S 71.15°W / -32.54; -71.15
TypeThrust
Areas affectedChile, Valparaíso Region
Max. intensityIX (Violent) MMS[1]
Tsunamiminor
Landslidesmultiple
Casualties83 dead, 447 injured

Tectonic setting

Central Chile lies on the destructive plate boundary where the Nazca Plate is being subducted beneath the South American Plate. The rate of convergence at this boundary in central Chile is about 74 mm per year. The boundary has a long history of destructive earthquakes and damaging tsunamis. Events occur on the plate interface and within both the subducting slab and the over-riding plate.[2]

Earthquake

The focal mechanism and hypocentral depth of this earthquake are consistent with rupture along the plate interface. The aftershock locations spread from the epicenter westwards towards the trench.[3]

Damage

The earthquake caused widespread damage across central Chile, with the port city of Valparaíso being the most affected. A total of 83 people were killed, a further 447 were injured and 40,000 made homeless.[1]

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References
  1. "Comments on the significant earthquake". National Geophysical Data Center / World Data Service (NGDC/WDS): Significant Earthquake Database. National Geophysical Data Center, NOAA. doi:10.7289/V5TD9V7K.
  2. ANSS. "Valparaiso 2017: M 6.9 - 40km W of Valparaiso, Chile". Comprehensive Catalog. U.S. Geological Survey
  3. Malgrange, M.; Deschamps, A.; Madariaga, R. (1981). "Thrust and extensional faulting under the Chilean coast: 1965,1971 Aconcagua earthquakes" (PDF). Geophysical Journal International. 66 (2): 313–331. doi:10.1111/j.1365-246X.1981.tb05958.x.
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