“The Valley of the Mocha is located on the banks of the Bio-Bio, two and a half leagues to the north of San Vincente, three from Talcahuano and many more from Penco...” (Fernando Campos Harriet) The earthquake and tidal wave of 1751 made the citizens of Concepción seriously consider moving to other land that would offer greater protection against possible tremors. The governor at that time, Ortiz de Rozas, proposed numerous places, and in order to please the residents and prevent disagreement, decided to call a vote in Open Cabildo. The lands that were considered were: the plane of Landa, the hill of Parra and the Valley of the Mocha, the latter being the one chosen by the people as the new city.