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Compressional and shear wave velocities have been measured in three orthogonal directions in cubic samples of three groups of rocks
in both dry and water-saturated states under low axial stress.
The three groups of rocks consist of seven granite samples taken
from Bandarabbas, six sandstone samples from Chabahar and fifteen andesite samples from Oromieh. Thomsen's three dimensionless anisotropy parameters E, Y and £5 have been calculated for each sample. The results show that for all three groups of rocks the
assumption of elliptical anisotropy is justified. Also it is observed that
for all of the rocks the elastic constants, Young's moduli, Poisson's
ratios and bulk moduli in saturated samples are greater than corresponding values in dry samples.