Streaming potential in volcanic rocks from Mount Pelée

Abstract

Streaming potential and electric conductivity have been measured in a laboratory on 11 consolidated samples coming from five deposits of the different evolutionary stages of Mount Pelée volcano. The streaming potential coupling coefficient ranges from -35 to -4905 mV MPa-1 and increases with increasing permeability. This increase is mainly due to the dependency of rock effective conductivity with permeability. The permeability of the samples varies from 0.146×10-12 to 34×10-12 m2. The zeta potential, at pH = 7 and water conductivity of 2.1×10-4 S m-1, is relatively small for the majority of the samples. It ranges from -4 to -19 mV. According to water conductivity analysis on Mount Pelée, streaming potential coupling coefficients of -25 to -406 mV MPa-1 can be expected for this volcano. Copyright 2000 by the American Geophysical Union.