The Pichilemu Fault (Spanish: Falla de Pichilemu),[1] also referred to as the Pichilemu-Vichuquén Fault (Falla de Pichilemu-Vichuquén),[2] is a Chilean geological fault, located in Libertador General Bernardo O'Higgins Region, some kilometers away from Pichilemu,[1] at a depth of 15 kilometres (9.3 mi).

[4] At first, it was not known if it was formed during the February earthquake, or if it was just reactivated;[5] however, according to University of Chile geologist José Cembrano, "[it] corresponds to a long-live fault (in a million years time) whose activity had not been detected before.

[6] The reverse fault has a north-northeast to south-southwest strike and dips to the east.

[6][7] "This is a new record that we have found, and it explains why Pichilemu is experiencing so many tremors," the director of the Seismological Service of the University of Chile, Sergio Barrientos told La Tercera on May 22, 2010.

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