Hydrothermal activity detected by self-potential measurements at the N-S volcanic axis between the volcanoes "Nevado de Colima" and "Volcán de fuego de Colima" (México)
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Abstract
Measurements of electrical self-potential (SP), taken on the north-facing slope of the Fuego de Colima volcano, show a large scale anomaly non-correlated with the cone which is active at present. This may arise due to hydrothermal activity which originates in a highly fissured zone above a heat source, located deep below the Surface of the earth. It is presumed that this anomaly is linked with the N-S volcanic axis, running from Nevado, the oldest volcano in the Colima volcanic chain, to Fuego, the site of the present activity.
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