Abstract
Two-dimensional numerical calculations of streaming potential associated with hydrothermal circulation in permeable crust have been carried out. It is assumed that the streaming potential coefficient varies as temperature changes along the flow of water. Using the realistic values of the ζ-potential given by Ishido and Mizutani (1981), we showed that an observable self-potential anomaly can appear over a hot zone, where convective hot water is rising. The polarity is positive and the magnitude is 10 to 100 mV when the water flow rate is 10-8 to 10-7 m/s. Calculated selfpotential profiles are compared with recent observations at the Nigorikawa and the Hachimantai geothermal areas in Japan.
