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The presence of pores and cracks in rocks causes the fluid-saturated wave velocities in rocks to be dependent on frequency. New measurements of the bulk modulus at low frequencies (0.02-0.1 Hz) were obtained in the laboratory using oscillation tests carried out on two hydrostatically stressed Fontainebleau sandstone samples, in conjunction with ultrasonic velocities and static measurements, under a range of differential pressures (10-95 MPa), and with three different pore fluids (argon,doi:10.1190/geo2013-0070.1 fatcat:ooeeajig3jhdtkwopdkdor7yea