Structural Controls on the Hydrothermal System of Villarrica: Evidence from Self-Potential Measurements (original) (raw)

Abstract

Geological studies at Volcan Villarrica have investigated the volcanic history of this part of the Andes southern volcanic zone but have revealed little information about the hydrothermal and magmatic circulation system. Hydrothermal circulation, and the extent over which it is active on volcanoes, has connotations to hazard mitigation as areas within the hydrothermal cell are often less competent and more prone to failure. A self- potential survey was conducted over a period of three months on two sub-parallel transects from the summit of the volcano. Initial results suggest fluid circulation is occurring. The survey detected a strong amplitude dipolar anomaly reaching a value of -2.7 volt, the minimum in the self potential data indicating the transitional zone from a hydrothermal to hydrological regime of fluid circulation. This anomaly is believed to be a result of a combination of rapid fluid disruption, electro-kinetic, and thermoelectric effects within and surrounding the magm...

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