# Translations:Dictionary:Anisotropy (seismic)/3/en

Jump to navigation
Jump to search

- In isotropic media (the simplest case) there are only two independent constants among 12 nonzero elements of this matrix. These may be taken as the longitudinal modulus M and the shear modulus . A non-zero linear combination, also appears in the matrix. Other elastic parameters, such as the bulk modulus may also be computed from these, see E-5. In the isotropic case, the longitudinal wave is
*exactly*longitudinal (polarization vector exactly parallel to wave vector), and the two shear waves degenerate to one (with a velocity independent of polarization direction, which may lie anywhere within the plane*exactly*perpendicular to the wave vector, hence no shear-wave splitting).