Dictionary:Epsilon ε

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1. Dielectric permittivity; see Maxwell’s equations.

2 The fractional change in the P-wave velocity:

where c11 and c33 are transverse isotropy elastic constants[1]. See Thomsen anisotropic parameters.


  1. Thomsen, L., 1986, Weak elastic anisotropy: Geophysics, 51, 1954–1966.