Pichilemu Fault
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).[3] The fault is 40 kilometres (25 mi) long and 20 kilometres (12 mi) wide.[3]
The fault became active after the February 27, 2010 Chile earthquake, and gave rise to the 2010 Pichilemu earthquake on March 11.[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."[1]
"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.[3] "It is not a crack nor an opening. It's a landslide," Barrientos added.[3][6]
The Pichilemu Fault, along with the San Ramón Fault, was as of 2011 being studied by geologists of the University of Chile.[1]
References
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