What is the strongest recorded earthquake?
1960 Valdivia earthquake
About 100,000 people lived in the affected zone.[23] Plans were made to evacuate Valdivia, and many people left. To avoid the destruction of the city, several military units and hundreds of workers from ENDESA, CORFO, and MOP started an effort to control the lake.[22] Twenty-seven bulldozers were put into service, but they had severe difficulties moving in the mud near the dams, so dykes had to be constructed with shovels from June onwards.[22] The work was not restricted to the lake; drainages from other parts of the Seven Lakes were dammed to minimize additional flow into Riñihue Lake. These dams were removed later, with the exception of Calafquén Lake, which still retains its dam.