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where cij indicate elements in the elastic constants matrix [1].

Another Thomsen anisotropic parameter is , and with weak anisotropy, , which is independent of , is generally used instead of it is the most critical factor for transverse isotropy[2]:

  1. Thomsen, Leon (1986). "Weak elastic anisotropy". GEOPHYSICS 51 (10): 1954–1966. doi:10.1190/1.1442051. PDF version.
  2. Thomsen, Leon (2002). Understanding Seismic Anisotropy in Exploration and Exploitation. Society of Exploration Geophysicists. doi:10.1190/1.9781560801986.