1985 Rapel Lake earthquake
 Pichilemu
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| Date | 8 April 1985 |
|---|---|
| Origin time | 21:56:59 UTC-4 |
| Magnitude | 7.5 Mw |
| Depth | 37.8 km (23 mi) |
| Epicenter | 34°07′S 71°31′W / 34.12°S 71.51°WCoordinates: 34°07′S 71°31′W / 34.12°S 71.51°W |
| Areas affected | Chile, Argentina |
| Max. intensity | VII (Very strong) |
| Tsunami | No |
| Casualties | 2 killed |
The 1985 Rapel Lake earthquake occurred on 8 April at 21:56:59 local time with a moment magnitude of 7.5 and a maximum perceived intensity of VII (Very strong). The shock was centered 75 kilometres (47 mi) southwest of Santiago, Chile, with a focal depth of 37.8 km (23 mi).
The 9 April 1985 earthquake occurred in the same fault area as the 2010 Pichilemu earthquake, and is considered by University of Chile Seismological Service a thrust fault-type interplate earthquake.
The earthquake, measured in the Modified Mercalli intensity, reached magnitude VI in Curacaví, La Calera, Los Andes, Peñaflor, San Antonio, Valparaíso, and Viña del Mar; and magnitude V–VI in Concón, Constitución, Curicó, La Ligua, Melipilla, Papudo, Pichilemu, Puchuncaví, Quilpué, and Villa Alemana. The earthquake was felt throughout much of central Chile from La Serena to Osorno. It was also felt in Mendoza, San Juan, San Luis, Córdoba, Tucumán, and Santa Fe provinces in Argentina. According to national radio networks, the tremors "were felt along a 1,000-mile stretch of Chile from Copiapó in the north to Valdivia in the south and across the Andes mountains in Argentina".
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