The superficial layers of the Chan-Chan site were washed by the tsunami that followed the 1960 Valdivia earthquake , which produced waves of 12 to 15 meters . These waves possibly emplaced some disc-shaped cobbles in the terrace of Chan-Chan . The same kind of disc-shaped cobbles are found in the lower layers of human occupation in Chan-Chan , as well , leaving open the possibility that they were deposited by an ancient tsunami , according to Pino and Navarro
1960 Valdivia earthquake
1960 Valdivia earthquake
Chan-Chan