The October earthquake occurred in the area of the plate interface that ruptured during the 1943 Ovalle earthquake , which had a magnitude of 7.9 – 8.3 . Other major earthquakes have occurred in the same area like the Valparaíso earthquake of August 1730 , of 9.2 and the 1880 Illapel earthquake which registered a magnitude of 8.8 . This entire segment is delimited by the rupture zones of 1965 and 1971 in Aconcagua and 1906 in Valparaíso to the south , while to the north by the 1922 rupture in the Atacama Region
1943 Ovalle earthquake
1943 Ovalle earthquake
1997 Punitaqui earthquake