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For a plane wave with horizontal slownesses *p*_{x} and *p*_{y} and
frequency , the total displacement vector at
some point in space is given by

| |
(9) |

where . The
summation is over the six wave-types in the medium, which have
slowness vectors , particle-motion direction
, and amplitudes .
The strains in the medium are given by
,the stresses by .

** Next:** Boundary conditions at a
** Up:** REFLECTION AND TRANSMISSION COEFFICIENTS
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Stanford Exploration Project

11/12/1997