Dependence of Velocity and Resistivity of Volcanic Rocks on Temperature and Porosity

Abstract

Laboratory measured P-wave seismic velocities and resistivity's of water saturated Cenozoic volcanic rocks show a dependence on porosity, saturation, and texture. Seismic P-wave velocities decrease with increase in porosity, but appear to be unaffected by temperature changes between 25°C and 110°C. They also change with changes in water saturation. At high saturation (100%-85%) velocity decreases with increase in saturation. At low saturation this trend is reversed. Electric resistivity's decrease with the increase in temperature below the boiling point, and rapidly increase above this point. It decreased with increase in water saturation. In most cases, samples showing anomalous seismic velocities have anomalous resistivity's.