Translations:Dictionary:Transverse isotropy/19/en

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Thomsen parameters[1] are dimensionless combinations of elastic moduli which characterize transversely isotropic materials, that are encountered, for example, in geophysics. In terms of the components of the elastic stiffness matrix, these parameters are defined as:

where index 3 indicates the axis of symmetry () . These parameters, in conjunction with the associated P wave and S wave velocities, can be used to characterize wave propagation through weakly anisotropic, layered media. It is found empirically that, for most layered rock formations the Thomsen parameters are usually much less than 1.

  1. Thomsen, Leon (1986). "Weak Elastic Anisotropy". Geophysics 51 (10): 1954–1966. doi:10.1190/1.1442051.