Streaming potential in volcanic rocks from Mount Pelée

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−1and 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 0.146×10−12to 34×10−12m2. The zeta potential, at pH = 7 and water conductivity of 2.1×10−4S 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−1can be expected for this volcano.