A 6.9 earthquake occurred on March 11 , 2010 , 40 kilometers southwest of Pichilemu , O'Higgins Region , Chile . The 2010 Pichilemu earthquake was a 6.9 magnitude earthquake that occurred on 11 March 2010 , at 11:39 local time ( 14:39 UTC ) . It was positioned northwest of Pichilemu , O'Higgins Region , Chile .