The Reigolil-Pirihueico Fault (Spanish: Falla Reigolil-Pirihueico) is a second-order geological fault located in the Chilean and Argentine Andes. As the name implies it runs from Pirihueico Lake to Reigolil Valley. Reigolil-Pirihueico Fault run in north-south direction and is roughly parallel to the larger Liquiñe-Ofqui Fault which is located 15 to 20 km west of it to which it is considered a branch of. East of Reigolil-Pirihueico Fault, close or along the Argentina-Chile boundary, are a string of volcanoes pliocene to quaternary volcanoes; Lanín, Pirihueico, Huanquihué, Quelguenco and Chihuío.
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