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where λ and μ are the Lamé constants, E is Young’s modulus, K is the bulk modulus, and σ is Poisson’s ratio. See also wave notation and Sheriff and Geldart (1995, 44–45)[1].

  1. Sheriff, R. E. and Geldart, L. P., 1995, Exploration Seismology, 2nd Ed., Cambridge Univ. Press.